Thanks. Didn't occur to me, but obviously much more stable than what I was thinking. I'd rather have the frag tank up high, but much more difficult.
So now there are two more questions. I've heard some pretty rough things about glasscages. All I'm looking to them for is a stand that's modified to hold the frag tank, and the frag tank itself, 36x18x12. Not exactly dims that are going to take a lot of stress from the water column. Any naysayers, should I avoid them?
Other question, and Rob will I'm sure have a thing or two to say when he's over, but can I take a typical 90 gallon tank and make a decent refugium? I know most times they're baffled to make minimal movement. The tank I have sitting around is drilled top rear, and I'm thinking to reduce the piping to 1", bring maybe 50-100gph through it? Do I still need baffles? The thing is 24" deep, can't imagine the environment would be disturbed too much by this?