06-11-2007, 12:57 AM
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The air passing through the water isn't actually what puts oxygen into it. Its when the bubbles come to the top and break the surface. So having a powerhead running its jet across the top of the water line is plenty of oxygen exchange. Having a filter that brings water up then drops it back into the tank (like a hang on back type) will have the same effect.
i personally don't like to use air stones or anything like that because i think the air pumps are louder than power heads and the hoses get in the way and look bad.
I suppose the only real reason to have an air pump is if you like the look of the bubbles or want a fake clam shell or something.