Yea I have two power heads in there right now that I kind of think might be a little TOO much circulation. But I also have smaller ones in case. Thanks for the reply. I think I will take out the canister and use the HOB. I think I will make 2 carbon chambers and 1 ammonia remover (or so it's called ammonia remover). I have the aqua clear which has 3 spots for filter pads and carbon and all that. Should I remove the filter pad from the filter? I read that's what makes it a nitrate factory.