So I am wondering about filtration...I am setting up a 33 gallon for 2 goldfish. I originally was filtering with a filter that says it filters 200 gallons/hour (for aquariums up to 50 gallons). Since I realize how messy the golfish are and that I am stretching it with the 33 gallon, should I instead get a filter that filters 350 gallons/hour (for aquariums up to 75 gallon). Is it possible to overfilter??