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[APD] Re: O2 use and CO2 at night

> I know plants are net consumers of O2 in the dark but CO2
> doesn't displace O2 so O2 hasn't much to do with it.

Plants don't use much O2 at night. Fish, bacteria, critters are by far the
largest drain on O2.

Also, these same critters also make up for the CO2 losses in well
established planted tanks so that the pH rise is less in older tanks vs new
etc at night.

Tom Barr

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