03-13-2011, 03:36 PM
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You have probably read my comments elsewhere about balance; the success of a planted tank is simply a case of balance--light and nutrients must be balanced. The level can be low to high, which means the "low" end is minimal light (just sufficient intensity, spectrum and duration for the plants to be able to photosynthesize) with nutrients (including carbon as CO2) in balance; at the "high" end the light is more, and the nutrients are more. Increasing just one aspect (example, just light, or just carbon via CO2, or just iron) is not going to assist the plants (assuming there is a balance to start with).
It is certainly not "necessary" to add CO2 to most tanks for plants to grow. I mean, look at the photos of mine ("Aquariums" below my name on the left); there is no added CO2 in any of these, and the plants are thriving to my satisfaction. Growth may be slower, and there are some plants I would not have much success with, but these tanks are geared for the fish first and foremost so the plants have to be satisfied.
But in order to answer your question whether it would be better/worse to continue/discontinue your CO2, I need to know about the fertilizer you are using. What brand is it, and how much/often are you adding it? Once I know this, I should be able to offer some indication on the CO2 question.