Liquid carbon for lush, green plants, with no CO2 system required. Seachem Flourish Excel is a source of bioavailable organic carbon that your aquarium plants use to grow. Every plant needs carbon, usually from CO2, and Excel delivers it in an easy daily dose. Use it on its own in a low-tech planted tank, or alongside pressurized CO2 for even faster growth. Round out your dosing routine with Seachem Flourish and Flourish Trace, and browse our freshwater plants. Why Flourish Excel Bioavailable organic carbon that plants can use right away for stronger, greener growth. No CO2 system needed, ideal for low-tech planted tanks, and it also complements pressurized CO2. Simple daily dose straight from the bottle, with no equipment to install. Helps with algae, many keepers use it to discourage certain nuisance algae. How to Dose When Dose Starting out, or after a large (over 40%) water change 1 capful (5 mL) per 40 L (10 US gallons) Ongoing maintenance 1 capful (5 mL) per 200 L (50 US gallons), daily or every other day Each cap thread is about 1 mL for smaller tanks. Start on the low end and work up. Some sensitive plants such as Vallisneria, mosses, and Anacharis can react to higher doses, so ease into it if you keep them. Choose Your Size Size Best for 100 mL Nano and small tanks, or trying Excel out 250 mL Everyday dosing on a mid-size tank 500 mL Larger tanks and long-term value Specifications Product Liquid organic carbon source for plants Sizes 100 mL, 250 mL, and 500 mL Use Freshwater planted aquariums CO2 system Not required, works with or without one Maintenance dose 5 mL per 200 L, daily or every other day Origin Made in the USA Recommended Pairings Seachem Flourish for a full trace-element supplement. Seachem Flourish Trace for trace minerals. Seachem Plant Pack to build a complete dosing routine. Browse our freshwater plants. Frequently Asked Questions Do I still need a CO2 system?No. Flourish Excel supplies carbon on its own, so it is a great fit for low-tech tanks. If you already run pressurized CO2, Excel can complement it. How much do I dose?When starting out or after a big water change, use 5 mL per 40 L (10 gallons). For ongoing maintenance, use 5 mL per 200 L (50 gallons) daily or every other day. Will it hurt my plants or fish?Used at the recommended dose it is safe for fish and most plants. A few sensitive species such as Vallisneria, mosses, and Anacharis can be affected by higher doses, so start low. Freshwater or saltwater?Freshwater planted tanks. Flourish Excel is a plant carbon source and is not used in saltwater aquariums.
