jasimek
New member
Do mp40's have to be opposite of each other in a 90 gallon? I have one on the side and am thinking about buying another. I do not have room on the opposite side of the tank as the dry side of the pump is too big as the tank is too close to the wall on that side. Would it matter if I installed one on the back of the tank and one on the side or would that not work right?