{"product_id":"seachem-flourish-excel-500ml","title":"Seachem Flourish Excel 500 mL – Planted Aquarium Carbon Supplement","description":"\u003cp\u003eSeachem Flourish Excel 500 mL is a bioavailable organic carbon supplement formulated for freshwater planted aquariums. Carbon is an essential nutrient used by aquatic plants during photosynthesis and the production of new leaves, stems, and roots.\u003c\/p\u003e\n\u003cp\u003eFlourish Excel provides plants with a readily available source of carbon that may be used as an alternative to injected carbon dioxide in many low-tech aquariums or alongside a pressurized CO₂ system. It also helps maintain iron in the more readily usable ferrous form.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioavailable Carbon Source:\u003c\/strong\u003e Supplies organic carbon that freshwater aquarium plants can use during growth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternative to CO₂ Injection:\u003c\/strong\u003e Useful for planted aquariums without pressurized carbon-dioxide equipment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with Injected CO₂:\u003c\/strong\u003e May also be used alongside a pressurized CO₂ system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports Plant Growth:\u003c\/strong\u003e Helps provide carbon needed for healthy leaves, stems, roots, and overall development\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIron-Reducing Properties:\u003c\/strong\u003e Helps promote the ferrous form of iron, which is more readily used by plants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConvenient Liquid Formula:\u003c\/strong\u003e Easy to measure and add during a regular planted-aquarium routine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge 500 mL Bottle:\u003c\/strong\u003e Suitable for medium and larger planted aquariums or continued use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Seachem\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Flourish Excel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 500 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquivalent Size:\u003c\/strong\u003e Approximately 17 fl oz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Planted-aquarium organic carbon supplement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquarium Type:\u003c\/strong\u003e Freshwater planted aquariums\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitial or Major Water-Change Dose:\u003c\/strong\u003e 5 mL per 10 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance Dose:\u003c\/strong\u003e 5 mL per 50 gallons daily or every other day\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBest Used For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLow-tech freshwater planted aquariums\u003c\/li\u003e\n\u003cli\u003eAquariums without pressurized CO₂ injection\u003c\/li\u003e\n\u003cli\u003ePlanted tanks using supplemental injected CO₂\u003c\/li\u003e\n\u003cli\u003eCommunity aquariums containing live plants\u003c\/li\u003e\n\u003cli\u003eSupporting active plant growth\u003c\/li\u003e\n\u003cli\u003eRoutine planted-aquarium fertilization schedules\u003c\/li\u003e\n\u003cli\u003eAquariums where additional available carbon is desired\u003c\/li\u003e\n\u003cli\u003eMedium and larger planted aquariums\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003eOn initial use or after a major water change greater than 40%, add one capful, or 5 mL, of Seachem Flourish Excel for every 10 US gallons of aquarium water.\u003c\/p\u003e\n\u003cp\u003eAfter the initial dose, add one capful, or 5 mL, for every 50 US gallons daily or every other day. Each thread inside the cap represents approximately 1 mL for measuring smaller aquariums.\u003c\/p\u003e\n\u003cp\u003eCalculate dosage using the aquarium’s actual water volume. Substrate, rocks, driftwood, decorations, and equipment reduce the amount of water inside the aquarium compared with its listed capacity.\u003c\/p\u003e\n\u003ch3\u003eMaintenance Dosage Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-Gallon Aquarium:\u003c\/strong\u003e Approximately 0.5 mL daily or every other day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-Gallon Aquarium:\u003c\/strong\u003e Approximately 1 mL daily or every other day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20-Gallon Aquarium:\u003c\/strong\u003e Approximately 2 mL daily or every other day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40-Gallon Aquarium:\u003c\/strong\u003e Approximately 4 mL daily or every other day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50-Gallon Aquarium:\u003c\/strong\u003e 5 mL daily or every other day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75-Gallon Aquarium:\u003c\/strong\u003e Approximately 7.5 mL daily or every other day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100-Gallon Aquarium:\u003c\/strong\u003e 10 mL daily or every other day\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese amounts are proportional calculations based on Seachem’s official maintenance dosage. Always follow the current instructions printed on the bottle.\u003c\/p\u003e\n\u003ch3\u003eInitial or Major Water-Change Dosage Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-Gallon Aquarium:\u003c\/strong\u003e Approximately 2.5 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-Gallon Aquarium:\u003c\/strong\u003e 5 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20-Gallon Aquarium:\u003c\/strong\u003e 10 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40-Gallon Aquarium:\u003c\/strong\u003e 20 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50-Gallon Aquarium:\u003c\/strong\u003e 25 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75-Gallon Aquarium:\u003c\/strong\u003e Approximately 37.5 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100-Gallon Aquarium:\u003c\/strong\u003e 50 mL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe larger initial dose is intended only for first use or after a water change greater than 40%. Do not use the initial dose as the regular daily dosage.\u003c\/p\u003e\n\u003ch3\u003eFlourish Excel and CO₂ Injection\u003c\/h3\u003e\n\u003cp\u003eFlourish Excel may be used as an alternative carbon source in aquariums without pressurized CO₂. It can provide substantial benefits for many planted aquariums without the equipment, regulators, tubing, and monitoring required by a gas-injection system.\u003c\/p\u003e\n\u003cp\u003eIt does not provide the same quantity of carbon as a properly managed pressurized CO₂ system. High-demand plants and densely planted aquascapes may still achieve stronger or faster growth with injected carbon dioxide.\u003c\/p\u003e\n\u003cp\u003eFlourish Excel may also be used alongside CO₂ injection. The two methods do not prevent plants from using the other carbon source.\u003c\/p\u003e\n\u003ch3\u003eFlourish Excel and Algae\u003c\/h3\u003e\n\u003cp\u003eSome aquarium keepers report that certain types of algae, particularly black beard algae, decrease while Flourish Excel is being used. However, Seachem does not manufacture or market Flourish Excel as an algaecide.\u003c\/p\u003e\n\u003cp\u003eDo not overdose the aquarium or apply concentrated Flourish Excel directly to plants as an algae spot treatment. Concentrated exposure may damage leaves, especially on sensitive plant species.\u003c\/p\u003e\n\u003cp\u003eLong-term algae control still depends on balanced lighting, plant nutrition, carbon availability, maintenance, feeding, water changes, and correction of the underlying cause.\u003c\/p\u003e\n\u003ch3\u003eSensitive Plant Considerations\u003c\/h3\u003e\n\u003cp\u003eAnacharis is particularly sensitive to Flourish Excel. Seachem recommends dosing every other day rather than daily in aquariums containing Anacharis.\u003c\/p\u003e\n\u003cp\u003eSome aquarists have reported leaf melting in Vallisneria after larger-than-recommended doses. Seachem’s testing found that standard maintenance dosing was generally tolerated, while higher doses were more likely to cause temporary leaf damage.\u003c\/p\u003e\n\u003cp\u003eWhen using Flourish Excel with sensitive plants, begin conservatively, avoid overdosing, and monitor the plants closely.\u003c\/p\u003e\n\u003ch3\u003ePlanted Aquarium Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMeasure each dose carefully\u003c\/li\u003e\n\u003cli\u003eUse the larger dose only on initial use or after a water change greater than 40%\u003c\/li\u003e\n\u003cli\u003eAdd the maintenance dose daily or every other day\u003c\/li\u003e\n\u003cli\u003eDose during the light period when practical\u003c\/li\u003e\n\u003cli\u003eAvoid pouring concentrated product directly onto plant leaves\u003c\/li\u003e\n\u003cli\u003eReduce dosing frequency around sensitive plants when necessary\u003c\/li\u003e\n\u003cli\u003eMaintain suitable lighting and complete plant nutrition\u003c\/li\u003e\n\u003cli\u003eContinue regular water changes and aquarium maintenance\u003c\/li\u003e\n\u003cli\u003eMonitor fish, shrimp, snails, and plants after dosing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Aquarium Care Note\u003c\/h3\u003e\n\u003cp\u003eFlourish Excel supplies carbon but is not a complete plant fertilizer. Aquarium plants may also require nitrogen, phosphorus, potassium, iron, trace elements, suitable lighting, and stable water conditions.\u003c\/p\u003e\n\u003cp\u003eFlourish Excel does not replace water conditioning, filtration, water testing, water changes, or proper aquarium maintenance. Do not exceed the recommended dosage in an attempt to accelerate plant growth or control algae.\u003c\/p\u003e\n\u003cp\u003eKeep the product away from children. Avoid ingestion and contact with the eyes. Follow all safety instructions printed on the bottle.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is Seachem Flourish Excel used for?\u003c\/strong\u003e\u003cbr\u003eFlourish Excel supplies a bioavailable organic carbon source for freshwater aquarium plants.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much Flourish Excel should I use?\u003c\/strong\u003e\u003cbr\u003eOn initial use or after a water change greater than 40%, use 5 mL per 10 gallons. Thereafter, use 5 mL per 50 gallons daily or every other day.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan Flourish Excel replace CO₂ injection?\u003c\/strong\u003e\u003cbr\u003eIt can serve as an alternative carbon source in many planted aquariums, but a properly managed pressurized CO₂ system generally supports a greater rate of plant growth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan Flourish Excel be used with injected CO₂?\u003c\/strong\u003e\u003cbr\u003eYes. Seachem states that Flourish Excel may be used alone or alongside carbon-dioxide injection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Flourish Excel contain carbon dioxide?\u003c\/strong\u003e\u003cbr\u003eNo. It supplies a bioavailable organic carbon source rather than gaseous CO₂.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Flourish Excel affect aquarium pH?\u003c\/strong\u003e\u003cbr\u003eSeachem states that Flourish Excel is not carbon dioxide and does not have the same pH-lowering effect associated with injected CO₂.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Flourish Excel kill algae?\u003c\/strong\u003e\u003cbr\u003eSeachem does not market it as an algaecide. Some aquarists observe reduced algae during use, but overdosing or direct spot treatment may damage aquarium plants.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs Flourish Excel safe for fish?\u003c\/strong\u003e\u003cbr\u003eYes. Seachem states that it is safe for aquarium fish when used according to the directions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs Flourish Excel safe for shrimp and snails?\u003c\/strong\u003e\u003cbr\u003eIt is commonly used in planted community aquariums, but dosing should remain within the manufacturer’s directions. Avoid overdosing and monitor sensitive livestock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan Flourish Excel be used with Vallisneria?\u003c\/strong\u003e\u003cbr\u003eStandard maintenance dosing is generally tolerated, but larger doses may cause temporary leaf melting. Avoid overdosing and monitor Vallisneria closely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan Flourish Excel be used with Anacharis?\u003c\/strong\u003e\u003cbr\u003eAnacharis is sensitive to Flourish Excel. Seachem recommends using it every other day rather than daily in aquariums containing Anacharis.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould Flourish Excel be dosed in the morning?\u003c\/strong\u003e\u003cbr\u003eDosing during the light period is ideal because carbon use is associated with photosynthesis. Seachem states that the product may remain available for up to 24 hours, so it can still be dosed at another convenient time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes Flourish Excel replace complete plant fertilizer?\u003c\/strong\u003e\u003cbr\u003eNo. It supplies carbon but does not replace nitrogen, phosphorus, potassium, iron, trace elements, lighting, or other planted-aquarium requirements.\u003c\/p\u003e\n\u003ch3\u003eAvailable at Tropical Treasures Wyo\u003c\/h3\u003e\n\u003cp\u003eSeachem Flourish Excel 500 mL provides a bioavailable organic carbon source for freshwater planted aquariums with or without injected CO₂. Visit Tropical Treasures Wyo in Cheyenne, Wyoming, to shop Seachem plant supplements, live aquarium plants, planted substrates, aquarium lighting, CO₂ equipment, fertilizers, and aquascaping essentials.\u003c\/p\u003e","brand":"Tropical Treasures Wyo LLC","offers":[{"title":"Default Title","offer_id":52224702152917,"sku":null,"price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/4545\/8133\/files\/SC04530-2T.png?v=1784901517","url":"https:\/\/tropicaltreasureswyo.com\/products\/seachem-flourish-excel-500ml","provider":"Tropical Treasures Wyo LLC","version":"1.0","type":"link"}