When I was on nano-reefs.com this evening, I came across a pretty interesting reef tank. I think you guys are going to be impressed with this. Or, at least I think you. Here's the link to his website that contains information on his build along with a nice little video.
http://www.konolua.com/RSS/Volcano_Tank/Volcano_Tank.html
http://www.konolua.com/RSS/Volcano_Tank/Volcano_Tank.html