I have a backpack skimmer in my spare bedroom. It is in there because the rio pump would always break. I finally got sick of replacing the pump and put it away. In its place I put an emperor 400 bio-wheel filter that I had from a previous tank. But I read a thread that said you can replace the rio with a maxi jet 1200 and it works fine. Has anyone done this? Should I get the new power head and put the backpack on or should I leave it the way it is. The tank is running good but the nitrates are at about 3 ppm. I have read that the bio-wheels may actually contribute to nitrates. Should I leave the bio-wheels on or put the backpack back on?