I'm looking at adding a sump to my tank. I want to put an overflow box on it that is 7 inches wide and would have a 1 inch drain into the sump. The sump would be about 20 to 30 gal
. Does anybody have any suggestions about what kind/size return pump that I would need. From the floor of the sump to the tank is about 4 1/2 to 5 ft.