Then I might go for the mag drive 18 that has a 1800 gph for 110 bucks. I was thinking of putting it on my 240 gal and at 6ft it will pull out 1125gph. Is it ok to circulate the tank 5 times a hour? is that to little or to much?
A good rule of thumb is to "Turn the tank over" 3 to 5 times an hour. You would be good with @1100 or so gph. Ive got a 180 and am running @1150 an hour.