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CO2 loss to air vs plant use

I think another approach would be to examine the pH changes which occur
in a tank with continuous CO2 injection during the day versus those of a
tank where the CO2 injection is stopped at night. There is a measurable
change in pH (correlated to CO2 concentrations) from morning to night
which is the plants consumption during the day but its not as great as
the pH changes if you stop injection according to other reports made in
the APD in the past. That was the original subject at issue anyhow.

Why not measure directly what you want to know when that's simple? ;-)

Steve  in Vancouver where the rain/snow has temporarily ceased.
Aquatic Gardeners Association