This was a winter break gone wrong.

What started out as a whim....eventually grew into this totally useless piece of desk lampage. After seeing this on MAKE Blog (highly recommended btw), I started drawing up my own version...which got a bit out of hand. I've had it completed for awhile now and I honestly cant see myself ever having the nerve to actually put a live fish in this thing (not that I could handle the resposibility of feeding it on a regular basis anyway).
If I was for some reason to want to put a fish in here....can anyone out there tell me what kind of fish could live in such cramped conditions?