08-19-2007, 11:52 PM
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There are very few plants that really "require" CO2 for growth but if oyu plan to get the higher light plants and get higher light you will want CO2. Once oyu get above the medium/moderate light levels, algae will eventually thrive without enough CO2 because the plants will use the CO2 quickly and not have enough to grow fast enough to out compete the algae for nutrients. Excel can stave off the algae but will not cure the problem.
Plants that do muc better with CO2:
Cabomba, HC hemianthus Callitricoides, any and all ground cover including clovers, and others.
Basically if you want fast growth and want some of the more ornamental, difficult plants CO2 is a must to prevent algae problems if you don't invest in a LOT of Excel.