Flourish Excel is a source of bioavailable organic carbon. Carbon is one of the required macroelements all plants require. This is typically obtained from CO2, but, may also be derived from simple organic compounds (such as photosynthetic intermediates).
Dosage: On initial use or after a major water change, use 1 capful (5 mL) for every 40 L.
Thereafter use 1 capful for every 200 L daily or every other day. Dosing may be slowly increased in high-growth aquariums. For smaller dosing please note that each cap thread is approximately 1 mL.
Other Information: The use of either CO2 injection can be in conjunction with the use of Flourish Excel. Because the processes of producing photosynthetic intermediates and building onto them occur simultaneously. The combination is particularly ideal for situations when continuing to add CO2 could result in dangerously low pH levels. Flourish Excel also has iron reducing properties which promote the ferrous state of iron (Fe+2), which is more easily utilised by plants than ferric iron (Fe+3).