I am currently running a Protein skimmer and two powerheads with 60lbs of live rock in a 55 gallon tank. The guy at the local store convinced me that I need something stronger to turn my water over and that the protein skimmer was not adequate. I bought a canaster filter just to turn the water over. Is this true that I need this or did I waste my money? I am using the canaster just to turn the water over, not a filter.