Kevin, another resource would be texreefer. His inwall had a fish room in the garage. Whole nine yards to include a one horsepower chiller.

Also, get them to install a coaxial plug in there so you can watch the game while your playing, uh I mean working, on tank maintenance. best thing I got for the garage was the tv which keeps me occupied when I have to do the boring stuff in there.

And a little fridge with freezer will keep your fish food and beer at the appropriate temperature.

Enough room for a small chair so that you can frag, drink beer, watch the game, in comfort as a man should.

I'd recommend sound proofing the walls so you won't hear the boss nagging.... But I wouldn't dare suggest that she would ever nag (psst, just in case she reads these posts, if she doesn't then you know what I mean ;) ).