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Old 09-04-2017, 08:54 PM   #1
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How much CO2 ppm for a 40 gal tank??

Is there a specific number I need to have in my 40 gal tank?

I've herd like 25 to 30 ppm is a good level.

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Old 09-04-2017, 09:15 PM   #2
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I think that range is regardless of tank size.
Generally speaking, the larger the tank, the more CO2 needed. You also need to factor in injection/diffusion method, tank circulation, and surface agitation.

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Old 09-04-2017, 09:27 PM   #3
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30ppm is generally the target you want. It is fish dependent. If they can handle more, gsm. If not, dial it back. Move in increments, not big jumps
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co2, tan, tank

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