I am currently in the process of setting up a 45 gallon tank. I plan to have a group of subadult angel fish. I currenntly have a Fluval U4 filter, but I feel that the current may be too strong for the angel fish once i have them in there, plus the flake food gets caught in the filter and decay. I also have ATI sponge filter desgned for a 50 gallon tnk. I was wondering if the sponge filter may be better for the angel fish tank. PLease advice.