I'd like to have a setup something like Ed's:
http://www.reefcentral.com/forums/sh...=&pagenumber=1
He has his returns going over the edge of the tank, but I'd like to drill for the returns too just because I think it'd look a bit nicer than having the plumbing come back over the edge of the tank. I have considered the hang over returns also, but I'm not too fond of them.