All, I have been looking for a definative answer on the flow rate of a filter and the size of a tank. After many hours of searching i have something that might put some newbies at ease (FW
ONLY). Most manufacturers recommend 4-5 times the gallons of your tank per hour so 50 gallon tank is 200-250 gph
. I personally will always use more than this in my personnal tanks although i dont think it is nessecary. Remember bigger is better when it comes to filters and paychecks.
PS. If you have messy eaters or just overall filthy fish go with a bigger filter its just the right thing to do.