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From The Aquarium Wiki

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[edit] What is it?

This is a commercial product in bottle form that contains a liquid that you add to the aquarium water in controlled dosages which adds a form of Carbon for plants. It can be use to supplement CO2 use and is used to reduce algae.

Whilst not quite as effective as using CO2, it does provide a ready source of carbon that will not be released by aeration.

There are several forms on the market.

• Flourish Excel by Seachem

• EasyCarbo by Easy Life

• Aqua Carbon by AE Design (Aqua Essentials)

[edit] Ingredients

Seachem's Flourish Excel uses Polycycloglutaracetal, the others are believed to contain Glutaraldehyde (C5H8O2), all a potent disinfectant if overdosed.