Join Date: Jan 2014
Location: Toronto, Canada
From what I experience with any of my ceramic diffusers - either glass, steel, or acrylic, the bubbles would just slowly drift to the surface with no current in the tank. I understand what you're trying to achieve, but using co2 diffusion to circulate will not work as effectively as compared to air pumps.
In my 12x12" cube I run a canister just to move the co2, so I'd strongly recommend a small pump atleast.