coral/frag tank written all over it...and then the chiller used to keep the water cooler bc of the halides you would run above it.
Well thats what I'd do.
Actually I have a very similar tank, I tried keeping fish in it, but they frickin' hated the lack of height, so I took it down.
Heres a pic of my lobster tank, 60ish gallons though, I might keep it around for the same purpose I mentioned above.