Seachem flourish excel is a source of bioavailable organic carbonr all plants require a source of carbon this is typically obtained from co2 but may also be derived from simple organic compounds such as photosynthetic intermediates therefore one can derive a substantial benefit with the use of flourish excel either alone or in conjunction with co2 injectionr flourish excel also has iron reducing properties which promote the ferrous state of iron fe2 which is more easily utilized by