Planted Tank Obsessed
Join Date: Dec 2010
Location: Binbrook, Ontario, Canada
Oxygen diffuses into water much easier than CO2, so being that you are only injecting ambient air into the tank, the majority of the surface area in contact with the air is being used to absorb o2 with vary lilttle contact with CO2. Also, you may actually be causing more CO2 to offgas the tank by causing turbulance at the surface.
Anyway regardless of the true results, I personally would not like to see all the bubbles floating throughout my tank. It looks ugly to me.