FAQ: Is Seachem Flourish Excel™ a replacement for CO2 in a planted aquarium?

A: Yes and no. It provides the same benefit as CO2, i.e. it provides the plants with a source of carbon for growth just as CO2 provides them with carbon. However CO2 by itself will give you quantitatively more growth than Flourish Excel™ by itself, although Flourish Excel™ does provide a substantial amount in comparison. If CO2 is a 10, Flourish Excel™ is a 6-7. Using both together provides additional benefit. One of the advantages of the Flourish Excel™ is no up front equipment costs and complexity of valves, hoses and regulators, etc.

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