Hello, I currently have a 150 gallon aquarium set up with a rena xp3 canister filter, filtering up to 175 gallons. But recently through the forums I've been hearing great reviews on wet dry filters, and also heard it'd be a good idea to get one on my tank to assist the canister. This sounds great to me, as those bio balls' bacteria and oxygen supplement sounds great, but I know nothing of them. I would appreciate all insight on good brands, good types of balls/systems, good gallon output for my size, etc. Also any additional information you all know about them would be welcome. Thank you!