woo-hoo! i practically killed myself and my little sister to do it, but i now have a 30 gallon sump on my 55 gallon reef tank! it fit (well, meaured like it would fit) up, over and behind the tank. of course, that was all in theory, and we ended up having to scooch the whole tank foward the tiny tiniest bit (so heavy) and *squeeze* it down there. i thought it was going to break for sure. phew! and i rearranged all the rock, and i got a protein skimmer (although i can't seem to find any of the 8 air pumps i have, so it's not going yet) and, and, and...! my tank looks rad, and i'm so happy knowing i'm making my tiny world a better place!