I would suggest you look for a used tank that's a bit bigger. For a doctor's office, 45 is pretty small. Perhaps a 75 could be tracked down? And I am sure there are some folks in the club that would help build a stand and canopy, in exchange for beer and pizza.
Sorry for reiterating, but for an office environment, the auto-topoff system is a must in the long run. (IMHO) You can set that up for as little as around 75 (
float switch/outlet combo - $60 &
aqua lifter &
aqua lifter filter). That and a used up salt bucket - those are good as they have a lid which can keep little hands out of the inside content, maybe pH 12 kalkwasser.
Anyhow, just some thoughts.
And I think planning for some hardy corals is great. Xenia are pretty, especially to non-reefers. GSP, Kenya tree work as well. Some euphylia species should work pretty well, too... That and other LPS...