02-01-2007, 08:04 PM
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True, the plants will put on growth when you add the CO2, but that growth then slows down again until you add it again. And unless you are using a bell-shaped diffuser which holds CO2, like in an upside-down bowl, the CO2 in the water decreases. Also, if it's a bell-shaped diffuser with CO2 under it, it's always a good idea to have some current under the diffuser, or the CO2 will go into the water at a much slower rate, thus, not doing much good. And as the other person posted, doing CO2 only now and then, you run a very high risk of BBA due to fluctuating CO2 levels.