 
Aquarium Plants; Basics, Substrate, Ferts, CO2, Lighting, Dips and other Factors. Aquarium Plant Information about: • Hornwort, • Anubias, • Anacharis/Elodea • Java Fern, • Java Moss, • Water Sprite, • Amazon Sword, • Banana Plant, • Rotala Macrandra and more Information about: • Algae Control • Oto Catfish, • Cherry Shrimp, and • Apple and Nerite Snails Also; Further Reading references |
 AQUARIUM PLANTS (Planted Freshwater Aquariums): By Carl Strohmeyer This article is intended as a basic to somewhat advanced article for Freshwater Plant keeping. Information will be revised and more added on a regular basis. For more about algae control in planted tanks, please scroll down to my summary. For healthy plants you will need; *PROPER LIGHTING: 3-4 watts per gallon is a VERY basic principle (for which I believe is a vast over simplification), there is a lot more that goes into the equation than this. A couple is the light spectrum and temperature; Photosynthesis takes place at the blue end and even more so at the red end of the Nanometer curve (420 nm blue and 670 nm red). A bulb in the 5500- 6700 K range is generally best for plants (a bulb below 5500 K will have to much yellow which will allow for more algae growth and less plant growth). I will also note that although I have read statements that actinic bulbs (blue spectrum) will tend to grow more algae, I have never observed this in switching between all daylight (6500 K) and 50/50 (blue/ white), the reason is simple in that much of the green plant & algae growth occurs in the blue end of the spectrum, so this goes for plants and algae meaning both have an equal shot at using this light energy for growth. The Lux that reaches the plants is also important. Another factor is lumens per watt. For MUCH more expanded information about lighting (including more in depth explanations of the above subjects), please read this article: “AQUARIUM LIGHTING, Kelvin, Nanometers and more” Generally around 12 hours per day is best, I recommend using a timer.  The new power compacts that are self ballasted are great for planted aquariums large or small. The even newer (pictured below) SHO (Super High Output) CFL use 85-105 watts however these awesome bulbs put out the equivalent of 425 and 525 watts respectively!Besides the new SHO technology, the new T-2 lamps are also great plant lights with over 70+ lumens per watt and very compact size. These bulbs come highly recommended for planted aquariums. *SUBSTRATE;  This is provided by a good sandy base and careful cleaning so as to not disturb this. The roots are support symbiotic bacteria that aid in Nitrate assimilation and other processes.For healthy plants I suggest a substrate of #00 sand mixed with Azoo Plant Grower Bed ADA Aquatic Substrates or maybe Eco Complete about 3-5 cm deep with a layer of #3 gravel on top about 2 cm deep. This combination works well for plant roots, ease of vacuuming the top layer ONLY (where plant roots are), and for better bio filtration. You can substitute Azoo Plant Grower Bed or similar with a sandy top soil or compost (although usually not as good a source of iron), by preparing the soil thus; Gather aged compost or sandy top soil, add water then rinse and strain to remove large debris until the water runs relatively clear (do not over rinse or you remove nutrients). I then will let it sit in the open for a few days to let any anaerobic bacteria die off (A 10:1 bleach solution can be used, although some recent experiments of mine suggest this will destroy valuable organic nutrients, although this will not affect mineral nutrients). The sand that is left is what you mix with your plant roots, please note that although an inexpensive route to go, this ‘homemade plant substrate is not as good as Azoo Plant Grower Bed. Please be careful with some of the anecdotal advice floating around the internet as to Eco Complete (and many other aspects of plant care), although this is good product (Azoo is better in my and others in the aquarium service communities experience), the bacteria contained therein is more of a gimmick based not only on my experience but on my research as well. Also be aware that some experts such as Tom Barr question ADA as well. Other sands for use as a substrate for planted freshwater aquariums Pool Filter sand and “play sand” are commonly recommended and used for planted aquariums as well. There is a lot of mis-information both pro and con as to the use of these sands for planted aquariums. To start with these sands are primarily silica sand with play sand being more dusty. Some have stated that silica sand is unsafe for use in either freshwater or saltwater, however nothing is further from the truth as silica sand is 99.0-99.9% SiO2 and is considered "totally insoluble" in water according to the US MSDS. The fact is that your aquarium glass is made primarily made from this ingredient and would also be dangerous to your fish if this were true. The second aspect of the use of these silica sands (the con), that is often promoted by advocates is that these sands provide nutrients necessary for plant roots. This is definitely not true as well and is NOT a reason to use pool sand or play sand as already stated these sands are primarily SiO2 and do NOT have other minerals such as iron that are important to plant roots! Please reference this article: Pool Sand Composition Here is more information about my experience and use of Azoo Plant Grower Bed . I prefer to use this product (or similar such as Eco Complete or composted soil) under my regular gravel as Plant Substrate will settle under most larger aquarium gravels or pebbles. I find that this will generally work well when enough is supplied around the roots while this method keeps costs down as well (vs. using Azoo Plant Grower Substrate as the sole aquarium substrate). I conducted a controlled test where tap water and water containing Plant Grower Bed (25% by volume) were sealed with loose plastic wrap (for evaporation control) and tested one week later. The results; Azoo Plant Grower Media: pH 6.5, KH under 20 ppm. Control: pH 7.0, KH 50 ppm My aquarium use has not had any KH or pH problems, however there are many factors at play too, including the use of Regular Wonder Shells for minerals and electrolytes. Transplant: Transplant is an important consideration in keeping healthy aquarium plants. The environment (pH, GH, KH, nutrient mix, light conditions, ECT) are not going to be similar in your aquarium as where his plant was uprooted (without much care I suspect too). Extreme shock and sterile gravel are going to play havoc with the initial transplant in to the aquarium. This shock can last a long period of time (this varies by plant, water environment, and transplant method), after this period the plant will eventually start to grow new leaves and begin to grow. *BIO AVAILABLE CARBON (CO2) and a Proper gas exchange: Reasonable surface agitation where gasses such as Oxygen and CO2 are added/ subtracted from the aquarium (although not violent of agitation) . You can add to the bio available carbon and CO2 levels through a product called Sea Chem Flourish Excel or a CO2 generator. This is where there is a lot of misunderstanding, the key is bio available. This why I find the Flourish Excel a useful product as this is bio-available organic carbon (when used in conjunction with good lighting and ferts. For more information about Flourish Excel from a Sea Chem question and answer fact sheet, please follow this link: SeaChem Flourish Excel FAQ CO2 is also provided by normal fish and other aquatic inhabitants through respiration, however true nitrifying bacteria use carbon dioxide (CO2) for their source of carbon thus depleting CO2 in the aquarium (please reference this article for more: “Aquarium Nitrogen Cycle”). You can tell if aquarium plants are photosynthesizing by observing the plants. When small bubbles form on the leaves of plants it is a sign that photosynthesis is occurring. This is commonly referred to as pearling. To increase CO2: • Add a CO2 system such as the Floramat or a more advanced CO Reactor system (I personally do not care for the yeast based CO2 system as they are often no more effective than the Floramat with a lot more hassles, for a more advanced system with a reactor, diffuser, and pressurized CO2 is the next step up). • Add Flourish Excel • Cut back on surface agitation, especially power head venturis or air stones. These however can be set to go on at night by using a timer when plants use oxygen, not CO2. Keep in mind that circulation is still necessary just watch the surface agitation where CO2 is exchanged for oxygen. • Be careful of organic buildup that can deplete CO2 via nitrification. Thorough and regular water changes are a must for more reason than this alone. Effect of light on CO2: • If the light is very intense and there isn't a corresponding larger amount of CO2, the light can harm your aquarium plants such as rough deposits on the leaves known as biogenic decalcification. • Too much CO2 without a corresponding amount of light will affect your aquarium plants ability to photosynthesize, and can also harm your fish (fish will be gasping at the surface due to poor oxygen/CO2 ratios in the aquarium). • A balanced tank will generally have more plants than fish. More about CO2 Units: As for CO2 generators, there are many ways of going about this; a DIY, a store bought CO2 reactor, or a CO2 bottle unit such as the Sanders Floramat CO2 Generator . For newbie’s (and even advanced aquatic plant hobbyists) I find the Sanders model the most foolproof. I will also note that even though I have used CO2 generators, they are NOT essential, especially in well lit aquariums with a lot of natural bio available carbon, what they do is act as a fast forward for plant growth and they definitely add more elements of healthy plants in your favor. I currently am using them (the Sanders Floramat) in my planted aquariums, I am also using are Azoo Plant Grower Bed , Sea Chem Flourish Excel , Wonder Shells and natural fish wastes.  For more advanced plant aquarists, I would not use a yeast based system (I have not found them any better if not worse than the Floramat with more hassles); I would go with the Advanced CO2 reactor systems that utilize pressurized CO2, CO2 reactors, diffusers, pumps with a venturi and filters such as a canister filter.Please click on the picture to the left for a better view of such a system. As to my earlier comment that CO2 Generators not being essential, please do not take me wrong, these devices can greatly improve your planted aquariums growth and over all health. However I also do not beginners to feel these are a must, as with many devices in aquarium keeping (such as UV sterilizers or Protein Skimmers) these are a useful tool. What is frustrating to me is the misinformation though both for and also against. One argument against these CO2 units is that running CO2 on planted tanks is not “natural”. This is the same arguments against UV Sterilizers (which I can boldly say I have researched VERY extensively). The aquarium is a closed environment and in this environment it sometimes necessary to use artificial means to achieve certain results such as strong plant growth with CO2 units or disease prevention, healthy Redox, and “unnaturally clear” water with UV Sterilizers. Some plants such as Rotala Macrandra are nearly impossible to grow without CO2 Units. CO2 Units also help with “flattening” plant growth within the aquarium where otherwise some plants grow only to the surface with thin stem to seek out CO2 in the air. Another advantage of CO2 units (of any type) is that they will help with weaknesses in other areas of plant care such as low organic carbon and other nutrient availability. The bottom line is I recommend them, but they are not essential. If you are a beginner and these devices seem overwhelming, try products such as Flourish Excel and follow some of the tips earlier in this article as to raising CO2. Also the Floramat is a very good CO2 unit for beginners to intermediate plant keepers, however for really serious planted aquarium keepers the CO2 Reactor systems (many BETTER systems can be DIY) are hard to beat. More about CO2 Of coarse there are dangers as well of diffusing too much CO2 into your aquarium, which can be dangerous to your fish, as levels over 30 ppm should be avoided! 3 ppm of CO2 is standard (as an established scientific fact), 10-25 ppm CO2 is considered optimum for the use of CO2 Units. This of coarse is a subject of ongoing debate, here is an outside article discussing optimum CO2 levels: The Krib: CO2 Concentration You can calculate CO2 levels (which can only be controlled by adding or subtracting CO2 produced by your CO2 unit, not by kH or pH) using this formula: CO2 (in ppm) = 3 times KH (as measured in degrees of carbonate hardness ONLY, not Phosphates!) times a factor of 10 deviation (+ lower/ - higher) form a PH of 7.0. Example: a KH of 1 with a pH of 6.0 would produce a CO2 level of 30 (1 * 3 * 10 = 30). A KH of 1 with a pH of 8.0 would produce a CO2 level of .3 (1 * 3 * .10 = .3) For conversion of KH; 17.9 ppm = 1 dKH. Please note that the presence of ANY phosphates will make this calculation fail. One more note, pH will climb during peak photosynthesis, especially in tanks with low hardness (yes hardness, not KH!)  Another way to test CO2 is with CO2 test kits (as well as droppers discussed below).Azoo makes a CO2 test kit that is a titration tester. After testing your CO2 in ppm or mg/L you need to correlate this with your aquarium KH. Here are the recommended levels for a planted aquarium with different KH levels. *10-15 ppm (mg/L) at 5 dKH (90 ppm KH) *15-30 ppm at 10 dKH (180 ppm KH) *30-40 ppm at 15 dKH (270 ppm KH) Here (below) is an interesting chart and calculator for the relationship between KH and pH as it relates to CO2 in planted aquariums: Measuring CO2 levels in a Planted Tank CO2 Drop Checker; Here is an excellent article about another more accurate method of checking CO2 when your aquarium water column has other sources of alkalinity such as high phosphates, or if you use products which are high in phosphates (like phosphate plant fertilizers, pH-up or pH-down, which have phosphate buffers): The Drop Checker by Walter Reed For a balanced discussion about CO2 generators, I recommend this group: Everything Aquatic For a DIY yeast powered CO2 Unit: DIY Yeast CO2 For a Sanders CO2 Unit; THIS IS WHAT I USE AND RECOMMEND! (excellent for beginners too in my opinion): Sanders Floramat CO2 Generator and diffuser *PROPER NUTRIENTS OR ‘FERTS’ (including minerals): Plant nutrients include nitrogen and phosphorous from fish food and waste and potassium that we add through the addition of ferts. Some trace elements including calcium, magnesium, and iron are also essential. In the case of Iron, too much in the water column can and often will cause algae problems. I prefer Iron to more available in the substrate. The fertilizer can be added to the substrate (the Azoo Plant Grower Bed supplies many of these nutrients, including iron), water or both. Deficiencies in Calcium can cause leaf curling or growth deformations. Maintaining a moderate level of GH (100 ppm >) is not only important for fish, it is important for plants as well. Calcium and Magnesium which are both found in GH are very important to plants. Deficiencies in Magnesium will inhibit the plants ability to produce Chlorophyll causing pale leaves. It has also been shown that carbonates produced by plants during hours of peak photosynthesis can raise pH substantially which can be harmful to fish present, however this is modified by an adequate GH level. Source: Interactions of pH, Carbon Dioxide, Alkalinity and Hardness Also KH (Carbonate Hardness is important for proper assimilation of CO2 as I have observed in many of the aquariums I have maintained. When the KH has dropped below 50 ppm (3 dKH) Carbon Dioxide use goes down which results in retarded plant growth (an often increased algae growth). Baking Soda can be used in a pinch here, however I recommend more complete buffers such as Sea Chem’s Alkaline Plant Buffer. For more about Calcium and Magnesium, as well as KH, please read this article: “CALCIUM, ELECTROLYTES, AND MAGNESIUM IN AQUARIUMS” You will need a Nitrate level between 15-40 ppm, iron (best in the soil, which is where the laterite or Azoo Plant Grower Bed helps), LOW phosphate levels to help plants compete better with algae, and many other trace elements that should be present from fish waste with a proper feeding regimen. I need to emphasize that feeding a proper fish food (one based in aquatic ingredients, less cereal, and less by products) will help in that there will be more minerals and other nutrients available for the plants after the fish is through with digestion. A good example is Spirulina 20. For more about quality fish food ingredients, please read this article: Quality Fish Food (Proper Aquatic Nutrition); What ingredients are needed for proper fish nutrition, growth and health. Some other nutrients can be supplied by products such as Flourish (which will provide iron), Plant Tabs or in the case of trace elements, Wonder Shells (which is what I use along with Flourish Excel and the Sanders Floramat). Cleaning; When cleaning your planted aquarium, do NOT over vacuum (this differs from a non planted aquarium), try and leave some organic mulm behind for eventual nitrate production. Also do NOT rinse your bio filter media such as sponges as thoroughly as you would in a non-planted aquarium as again this will aid in necessary nitrate production. A planted tank will also tend to consume more of your KH due to bio decomposition and the resulting acid production, so keep a close check on this parameter (GH is not depleted as readily, but still gets used by plants and de-composition) Here are basic planted aquarium water parameters (and some suggestions for these elements/nutrients): *GH: 100 ppm or higher (this is more important than many realize for planted aquariums; “during photosynthesis, a rise in pH can occur in low alkalinity water (20 to 50 mg/L) or in water with moderate to high bicarbonate alkalinity (75 to 200 mg/L) that has less than 25 mg/L hardness”) *KH: 50 – 100 ppm; important for good CO2 assimilation. I recommend Sea Chem Alkaline Plant Buffer for use in planted aquariums that tend towards low KH. *CO2: 20-25 ppm; Sanders Floramat CO2 Generator and diffuser or other CO2 unit, Sea Chem Flourish Excel *NO3: 5-30 ppm; Fish waste/food and proper aquarium maintenance procedures, Potassium Nitrate (KNO3) *K+ (Potassium): 10-30 ppm; SeaChem Flourish , fish food (adequately fed) *PO4: 1.0-2.0 ppm *Fe (Iron): 0.2-0.5 ppm; Azoo Plant Grower Bed or similar, Plant tablets such as Jungle, SeaChem Flourish *Ca: 100 ppm +; Wonder Shells, water changes, SeaChem Flourish For more about nutrients, please refer to our Algae section further down in the article. For more information about the often misunderstood relationship of GH to other aspects of water chemistry, including photosynthesis, please read this outside source: Interactions of pH, Carbon Dioxide, Alkalinity and Hardness *OTHER FACTORS: -Good water circulation is important for gas exchange (CO2, Oxygen). Water circulation is also useful to avoid stagnant spots. This said too much surface agitation can drive off necessary CO2. However often a timer is recommended that turns on an additional air stones at night when plants will use oxygen and NOT CO2. This is especially important if your aquarium has a CO2 system that continues to add CO2 at night which can be poisonous to fish at night as the plants will not use this CO2. -I also recommend algae eating fish to control the inevitable algae. I recommend Otos for small or community tanks or Plecostomus for larger aquariums. -A pH of between 6.5 and 7.8 works best in my opinion. *NEW PLANT DIPS: It is always a good idea to dip your plants prior to addition to your aquarium to prevent addition of strains of algae, disease, and unwanted snails. • Flourish Excel which contains aldehydes can be used in a 20 minute dip at 20 ml. per 40 L (10 gallons). This is effective for algae, many diseases and somewhat for snails. • Bleach used in a 20 parts water to 1 part bleach for 2-3 minutes for delicate plants and 4-5 minutes for broad leaf plants; followed by a quick dip in sodium Thiosulfate or other de-chlorinator/ water mixture. • Potassium Permanganate in a solution of water and enough Potassium Permanganate to turn you water pink for 20 minutes is also effective for many algae, diseases and usually snails. POPULAR AQUARIUM PLANTS (Some to have and NOT to have).  • Hornwort (Ceratophyllum demerson - Easy to grow fully aquatic plant, aids in nitrogenous waste removal (they are literal "nitrate sponges". Hornwort prefers neutral or alkaline waters. The one negative with this plant is that the Hornwort commercially available is not a true tropical plant and needs to be adapted slowly for aquarium use. This plant can be either floated or planted (weights are useful for initial planting). In the Tropical version (which is not commonly available) this plant is considered a strictly a floating plant. *Low to moderate light requirements This is also a plant that MAY be kept with Goldfish as goldfish tend to not bother this plant. The needles of this plant are usually too spiky for the goldfish to eat  • Java Moss (Vesicularia dubyana) - Easy to grow, tropical (from SE Asia), low light plant. A little goes a long way. The thinner this plant is spread over rocks and driftwood, the better it will root itself and the healthier it will look as it grows on your decor. This can take over your aquarium substrate in particular. *Low to high lighting requirements (high is necessary for strong growth, especially if used in breeding environments or Amano tanks)  • Dwarf Anubias (Anubias nana) - Easy to grow, tropical (from West Africa), any light, prefers a rich soil (sand) base. Dwarf Anubias is one of the easier plants to grow. This plant is so hardy that it can even survive out of water. Dwarf Anubias needs very little light and isn't very specific about water conditions. The only negatives are that they grow quite slowly and are vulnerable to beard algae. As in all Anubias species, they are grown from a rhizome (horizontal stem of a plant that often sends out roots and shoots from its nodes). *Lighting Requirements low  • Java Fern (Microsorum pteropus) – Easy to grow, tropical (from SE Asia), prefers lowlight, needs no soil. The Java Fern is quite undemanding and simple to cultivate, even doing well without extra nutrients or Carbon (CO2). The Java Fern is also an ideal plant to use in aquariums that have burrowing fishes, as these fish will usually not bother this plant. This plant should not be buried in the gravel (which also makes them ideal for UG filters), but rather placed on rocks and driftwood, leaving its roots loose in the water column. Java Ferns reproduce by daughter plants that are born on the edge of the leaves of the mother plant and grow off of this. Another possible plant for goldfish *Low to moderate light requirements  • Water Sprite (Ceratopteris thalictroides) – Easy to Grow, tropical (from Tropical Regions), does well in average light and simple substrates (sand/ gravel). A great plant for removing excess nutrients in the water, new leaves unfurl from the base of the plant into lacy fronds. Needs regular trimming to stay looking nice. Be aware fish love to munch this plant, but it grows fast. *Will survive in low light, but thrives in moderate to high light  • Anacharis/Elodea (Egeria densa) – Relatively easy to grow plant that is a good beginner plant. The Anacharis has branching stems covered in bunches of linear, slightly curled leaves. The Anacharis can be anchored in the substrate by its roots or will also grow when floating freely. This plant does well in both cold and warm water and is excellent for livebearers, although caution should be used with goldfish as they often will nibble at Elodea/Anacharis. The Anacharis does best in moderate lighting with added nutrients and added CO2 (Flourish Excel is often adequate), under optimum conditions this plant will grow rapidly and added much oxygen during hours of photosynthesis.  • Amazon Sword (Echinodorus amazonicus)- Moderately in difficulty to grow (from Brazil). Amazon Swords require high lighting and rich substrates (such as Azoo Plant Grower Bed ). These plants are relatively hardy and take root easily once they adjust to the new tank. Amazon Swords can be potted (like houseplants, in an aquarium) and in aquarium gravel, as both ways work very well. They have large root systems that can overwhelm other aquarium plants.  • Dwarf Lily (Nuphar stellata)- Easy to moderate difficulty to grow (patience is required for these). These are usually sold as bulbs as there are true lilys that have leaves that vary from green to brown to shades of red. The growth of these plants parallels Banana Plants (which is another type of Dwarf Lily). Often these Lily bulbs are sold by stores such as Walmart as Assorted “Aponogeton Bulbs” (usually dry) and many will never sprout (usually anywhere from 1/5 to ½ may not sprout). These are actually better to keep under low to moderate light, otherwise you will end u with large green common lily that looks more appropriate in a pond than an aquarium. Also Plecostomus do NOT do well with lilys (they will usually eat them faster than they can grow. These bulbs should not be planted, although plant soils such as Azoo Plant Grower bed can be added to the area around the bulb to aid in nutrients for the sprouting plant.  • Wendtii, Red (Cryptocoryne wendtii)- Easy in grow (from South-east Asia). These are excellent beginner plants that only require low light, tolerate soft to very hard water, and very wide pH range 6.0 – 9.0  • Aquarium Banana Plant (Nymphoides aquatica)- Easy to moderate grow (from SE USA). Banana Plants require moderate to high lighting with no special substrate requirements. Usually an easy plant to grow and to take care of. Banana Plants adapt to most water conditions. Do not make the mistake of burying these plants too deep. Banana Plants send leaves up 8-12 cm high approximately every 4 to 5 days it will also grow replica plants. A good plant for the beginner or serious hobbyist.  • Rotala Macrandra – Moderate to difficult to grow (from the Far East; Laos, Vietnam, ECT). Rotala Macrandra requires strong light, soft water (pH 5-7), CO2, and pruning to thrive and look their best in aquariums. Without CO2 these plants will tend to send thin stems to the surface and never really fill out.  • Plants I generally recommend not to have; Any terrestrial plant adapted to aquariums (plants that can't be grown submersed indefinitely) such as Mondo Grass, Purple Waffle, Aluminum Plant or Peace Lilies. I will make the exception that the above plants make excellent bog plants when the roots are kept under water (absorbing nutrients for better tank health) while the leaves are out of the water. One more exception would be the use of Dracaena (Dracena) when properly prepared and potted, please see this outside article: “Planting a fish Tank with Unusual Plants (Terracotta with Terrestrial)  Other plants I do not recommend are Cabomba as these non-tropical plants have high light requirements and tend to be difficult in warm aquarium environments which often results in this plant breaking apart and causing a mess. PLACES TO PURCHASE LIVE PLANTS ON LINE: The first one here I have personally purchased from and the plants were first rate! AquariumPlants.com Arizona Aquatic Gardens Anubias Design ALGAE CONTROL: When it comes to algae control in a planted tank this is also noteworthy as even though added carbon (CO2) will often help plants out compete algae, thus retarding unwanted algae growth, if algae grows out of control as soon as added carbon is removed, there are likely other problems contributing to this including; *Unusable/ unavailable nutrients (micronutrients and macronutrients). Here is a list of important nutrients (listed in recommended added solution, not ppm as stated earlier in the article): Potassium (often available as Soluble Potash)- .37%, Iron- .32%, Sulfur- .27%, Sodium- .13%, Calcium- .14%, Magnesium- .11%, Nitrogen- .07%, Nitrogen- .07%, Available Phosphate- .01%, Boron- .009%, Cobalt- 0004%, Copper- .0001%, Zinc- .0007% Molybdenum- .0009%,. Here are a few sources: Sea Chem Flourish, PMDD , Regular Wonder Shells, Jungle Plant Tabs . Not all these sources have all the required nutrients many can be mixed as you find your own success. Much has been published lately about the addition of PO4 (phosphates) to control algae, however I believe this is only partially correct and based on some false assumptions; PO4 along with NO3 and Potassium are important Macronutrients that need to be in balance. I have found that simply changing water will (assuming proper mineralization of new water) will control algae by adding all these macronutrients. What is happening is that algae are much better equipped than higher plants to compete in conditions of low nutrients, however the addition of these nutrients allows much better competition. Adding only PO4 does not bring these macronutrients into balance and even though many claim this solved their problem, they have not run a control group to see if this was only part of the equation. *Poor substrate for healthy plant growth (only certain plants!). Make sure your substrate is rich in Iron (Fe). Iron is the most important trace element; your tank substrate should contain a reasonable amount of Iron. Liquid iron will, if over dosed, favor Hair algae. It can be added through tablet Iron rich fertilizers and through substrates like Azoo Plant Grower Bed , Laterite and Fluorite *Important! - Poor lighting that does not allow plants to compete with algae. Although when more light is added more nutrients including CO2 are needed. I do not agree with the method of darkening a tank for a few days as plants often have higher light requirements than algae (in part due to their complexity), this only gives the algae more time to out compete plants! *High or too low Nitrates. Nitrates should be above 15 ppm for plants, but not above 40 ppm as I have seen in many aquariums with excessive algae growth (although high nitrates is rarely a problem in tanks with healthy plant growth). Too low and plants will starve for this important macronutrient. * Aquarium Cleaning Frequency. Often increasing the frequency (even twice or tree times per week) will improve conditions in the aquarium so as to allow plants to out compete algae. In part this improves the macronutrient balance as discussed above (as well as improvements in Redox and lowering DOC). I however do not recommend increasing the amount of water changed. *Trim plants of dying, decaying, or algae covered leaves, even if this removes much of your plants. This is much like pruning in your garden. This forces plants to generate new and healthy leaves that will often do better at out competing algae. *Dip your new (or even established plants, although this will cause a temporary shock to established plants) in Sea Chem Flourish Excel , this product can be used as a quick dip solution (about 30 seconds) for plants to kill algae. I recommend diluting with about 5 parts water with 1 part Flourish Excel, however I have not established an exact dilution as of yet, so any feedback from readers is appreciated. Also the dosing of Flourish Excel in your aquarium can be effective for algae control as well. Flourish Excel contains a polymerized isomer of glutaraldehyde trademarked as polycycloglutaracetal by SeaChem and is the active ingredient in this product, which is a fertilizer for aquatic plants. It is claimed that it provides a bioavailable source of carbon for higher plants that is not available to algae. Though not marketed as such due to federal regulations, the algaecidal effect of glutaraldehyde kills most algae at concentrations of 0.5 - 5.0 ppm. *Improper GH and KH levels (or mineralization, especially GH). Here is a quote: “The release of carbonate converted from bicarbonate by plant life can cause pH to climb dramatically (above 9) during periods of rapid photosynthesis by dense phytoplankton (algal) blooms. This rise in pH can occur in low alkalinity water (20 to 50 mg/L) or in water with moderate to high bicarbonate alkalinity (75 to 200 mg/L) that has less than 25 mg/L hardness.” Source: Interactions of pH, Carbon Dioxide, Alkalinity and Hardness *A poor Redox Potential which is often improved by better and more frequent water changes and proper mineralization such as Calcium, Magnesium and sodium as stated above. Also the addition of UV Sterilization Here is a common algae in Aquariums  Black beard algae is a form of "red algae" in the genus Audouinella that commonly attaches to edges of plant leaves or drift wood and is more common in low CO2 water conditions, that are low in minerals, carbonates, and pH (although these algae will also grow in alkaline, high pH waters as well). As stated above, many good aquatic husbandry methods will aid in combating this algae Physically removing rocks and wood that have these algae on it and then scrubbing it off will also give plants a better chance of utilizing nutrients and over coming these algae. The use of Sea Chem Flourish Excel has been shown to be effective for some in control of this algae. The reason behind this is that Flourish Excel is formula is Aldehydes based which are effected by oxidation which is another indicator of the importance of VERY regular but often small water changes (as much as 5-10% per day) to bring about a healthy Redox (among other methods of Redox control). This admittedly is only a theory at this point, however I have observed vastly better algae control (of all sorts of algae) in ponds where I achieved a healthy Redox via flow through water changes, mineralization and a PROPERLY installed UV Sterilizer. I will finally add that most true algae (not Cyanobacteria) compete with plants for the same nutrients and light, so battling algae is often very difficult, however from my experience with ponds in particular it is often a war than cannot be totally won but certainly can be checked by keeping nutrients away from algae (such as substrate nutrients) while providing them to plants and understanding that algae are more simple life forms than plants and have less complicated needs, so addressing the more complex needs of higher plants will allow them to out compete (sometimes this is as simple as removal of as much algae as possible to give the plants a foot hold, although this can also be a much more difficult task). For further reading in the subject of algae, Please see this Aquarium Answers Article (post): “Aquarium Answers; Aquatic Algae” . I also recommend this outside article: Aquarium Algae , POPULAR PLANTED AQUARIUM ALGAE EATING INHABITANTS;  * Shrimp- such as cherry shrimp.The Red Cherry Shrimp (also known as cherry red) is a popular shrimp in the aquarium hobby. Picture is of a "berried" female carrying eggs. This shrimp is one of the better fresh water algae eating shrimps. Red Cherry Shrimp are fairly easy to care for. As with most shrimp, they are very sensitive to ammonia and nitrite, so it is of great importance that the aquarium they are in has been established and cycled for a while. They prefer water around 70°F-80°F but it is reported that they can survive in water as cold as 50°F (not recommended). Most pH ranges suitable for aquarium fish will also work well for the Red Cherry Shrimp. For more Cherry Shrimp information, I recommend reading this article: Cherry Shrimp - Neocaridina denticulata sinensis  *Oto Catfish (genus Otocinclus)Popular non destructive algae eating catfish that usually mixes well in a planted community tank. Oto Catfish tolerate a wide pH range of 5.2-7.5 and prefer a temperature between 68 to 82 F (20- 28 C). Otos grow to 1.5” (4 cm). This page has a video of Oto Catfish being caught in the wild: Aquatic Videos Snails:  Apple Snails Apple Snails can live together with most fish species and they can be used to keep the aquarium clean of algae. Not all apple snail species are a good choice for aquaria as their voracious appetite for aquatic vegetation will often result in your aquatic plants being decimated. A Better choice for planted tanks: Nerite Snails  Nerite Snails are an easy snail to keep. I would recommend you keep them in water with a pH above 7.0 and a GH over 150 ppm is best for these snails being that these are snails that breed in marine or brackish water (Wonder Shells are good for this). Even if these snails lay eggs in your freshwater tank, they will not hatch unless you provide brackish or marine water which keeps these snails from over populating. Nerite Snails almost exclusively eat algae and do not seem to harm plants at all and can clean up very heavy algae growths in a month or two.For more about Nerite Snails; Arizona Aquatic Gardens; Algae Eating Nerite Snails For more about snail identification, please see this site: Various Freshwater Snails SUMMARY: Please be careful as to anecdotal and faddish advice in the care of aquatic plants and this is an area of aquarium keeping (along with reef keeping) that has a lot of advice floating around that is based more on opinion than facts or true research. This is also not to say this article is the only way to keep plants, that is my point there are many successful ways of keeping aquarium plants, just be careful of statements such as yeast based CO2 generators are the only way to go when in fact less glamorous methods such as Floramat works quite well (and is used by many in the aquarium maintenance community where it is more important uses economical methods that work over “popular” methods). Also nitrifying bacterial cultures do NOT survive in liquid form at room temperatures well at all. This why I know more in the Aquarium Service community that use Azoo Plant Grower Bed over Eco Complete as this is an un needed gimmick not to mention Azoo Plant Grower Bed is cleaner and more complete (although the complete statement itself in anecdotal based on mine and others in the service communities experience). ALSO as to CO2 or carbon, this is ONLY ONE ingredient in healthy plant growth (and algae control as well). This point is often missed even well funded terrestrial plant studies have shown that added CO2 will not increase plant growth without proper nutrients, substrate and light (the importance and what constitutes good Aquarium lighting is often misunderstood). Added carbon in the form of SeaChem Flourish Excel will also improve the effectiveness of a CO2 injection system or eliminate the need altogether (depending on other variables). FURTHER READING: Here is an excellent article about a CO2 drop checker: The Drop Checker by Walter Reed For Aquarium plant keepers who need to move up to ‘expert’ level, I would suggest this site: The Barr Report This site can answer many of your expert questions as plant keeping is not my aquarium specialty (mine is more in Aquarium electrolytes, UV Sterilization, diseases and disease prevention). I have found a few points of disagreement but these are far and few between. Recommended Forum for Plant Keepers: Everything Aquatic Here is an interesting Blog I recommend reading: Aquatic Eden For more aquarium information and articles (pond too), please visit this site:   
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