Wow...this is really bugging me now....I saw a thread, cant remember at all what site it was on, where this person had setup a coral reef outside, used just natural sun/day light for it..The place was in Portugal...will search some more....grrrrrr....where is it....
Oh how cool. Excellent idea. If I had something like that, though, I'd be DYING for a side-view! Seems to me that cleaning the glass would get old pretty quick.