So I'm new. That being said, I have a 65 gallon 2 weeks running now. I can't seems to find a position or setting for the wave makers that doesn't blow sand somewhere causing weird dips in my sand. The built in overflow is in the left corner. Maybe someone here has better knowledge of placement and settings on the pump. Also the instructions with the wp-25 must be from the old style because there are functions on the new controller that aren't even explained.