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Aeration/ CO2 loss
In APD #493, a suggestion was made to a newbie to remove extra aeration
from his tank to avoid removing CO2. The newbie did not have any kind of CO2
injection. I comment because I have seen this (incorrect, I believe)
advice before. A still, planted tank without supplemental CO2 will have less
CO2 in the water column (during the day) than the same tank with lots of
surface agitation. CO2 consumed by plants reduces the ratio of CO2 to other
dissolved gasses to a point below the ratio found in the atmosphere.
Aeration helps keep these ratios similar.
I have not tested this theory- I accept it on its logic. If there are
holes in it, I am sure I will hear about them :).