When I got my 55 gallon tank, I bought the filters that a friend was running on his 55 gallon. Right now I have a Whisper 30/60 (set at about 1/2 speed) and an Aquatech 55 running. Is there such a thing as too much filtration? I have a pretty good current going in there and my Tiger Barbs seem to really like it. Also running a Red Sea system to put CO2 in the water during the daylight hours.