04-21-2014, 11:28 PM
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didn't think about the 24-hour production, ... yes, that could be an issue if it's a significant amount, ...
completely off the top of my head and all uneducated guesses, i would guess it might be comparable to the DIY yeast CO2
yes, i'm aware that 2+ inches and the likelihood of anoxic zones are present, ... 3-4 inches and it's a pretty guaranteed to have a solid layer on the bottom of the substrate.
roots still slowly add O2 to the substrate ensuring no anoxic zones ... well in areas that are filled with roots.