As stated by others, more filtration is an absolute must. I have a 55 gallon tank and I run a Rena XP3 as well as a 35 gallon wet/dry that filters approx. 750 GPH. Between the two systems, the entire volume of my tank filters every 5 minutes. Besides, if you run 2 separate filter systems and 1 breaks, you always have something running and it isn't as much of a crisis situation.
With enough filtration, a powerhead isn't necessary.
