Well, I only have 1 gallon of bio-balls also, but I also have a mesh bio-roll, 125 lbs of Lr, 120 lbs of LS, and a canister w/ Kent Marine Nitrate Reductor. So, I only have 1 gallon of bio-balls, but also have a much greater source of biological filtration. So, IMO, you need more biological filtration, in some form or another.