Right now my 500 gal tank is filtered with a 75 and 50 gallon tank connected together filled with bio and a filter sock as my sump. My problems with this is that my sump sits on the side of ny tank (not under) and is an eye sore, and the gurgling noise is loud. Is there any way to avoid the whole sump idea in general? I know they have the sand filters but you still need a pre filter correct? My tank has 2 floor drains as well so the best set up if it were possible would be to have it go straight from the drain or overflow directly into the pressurized sand filter then to the pump and back to the tank... does anyone have ideas or links to making this close to possible? I have always been a sump guy but my stand is only 20 inches tall on this tank and I don't like my filtration off to the side.. :/