I'm going to be setting up a 75 and only filling it half way. I have an extra 305 that I'll be using as the filter but I don't want to create a giant water fall because it'll be too loud. So I'm thinking of finding a big piece of drift wood and having the out flow of water run down it. Do think this will will create enough O2 exchange in the water? I really don't want to add an air pump.
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