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Re: Air pumps (was:very mysterious deaths...)

Gitte writes:

> Also...now I am a trifle confused.  I thought air pumps were no-no's for
>  planted tanks.  You switch off filters to reduce turbulence, but doesn't 
>  air pump cause CO2 depletion?  Or is this not a problem in the dark?
CO2 is not used by plants in the dark, because photosynthesis stops.  Plants 
produce CO2 at all times, and re-utilize it during the day to make sugar.

Bob Dixon