I just finshed working on my sump to go in line with my wet-dry. My friend and i built the sump back in April out of a 20 gallon tank. but i wanted more so I added a 10gallon sump to it today. I built a cover for it that holds a 4inch big-bag. then i have a 1inch bulk head that overflowes into my wet-dry. I am pumping 800GPH on my 180gallon tank.