The Planted Tank Forum - View Single Post - how many 2 liter bottles?
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post #4 of (permalink) Old 01-29-2013, 03:53 AM
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How much CO2 you need depends on how much light you have. If you only have low light, you can get a very noticeable improvement with just one bottle, but the fluctuating CO2 output might lead to more algae than you would have otherwise. For medium light, I think 2 bottles would be enough, and the CO2 fluctuation would be less also. More light than that and I'm not sure that even 3 bottles would work well, considering that you would still have some fluctuation in the CO2 output, and might see more algae than you want.

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