If you don't want to put a sump underneath the tank and easy way to do one is to put one on a desk next to the tank. All you need is a maxijet 1200, some flex tubing from home depot, a tank drilled on its side near the top, and a bulkhead for the hole and drain tubing. Basically pump the water up to the fuge and let it drain back to your main tank. I used a 15g tank on my 55 and it worked real well. Advantages are that critters drain back to your main tank without an impellar tearing them up and you don't have to use a siphon drain line to a sump(Dangerous if siphon breaks and water keeps pumping to tank). Disadvantage-Mine got pretty nasty looking after running for a few years. Looked like a green swamp.