It is a great idea. My pediatric doctor has a huge tropical tank in her practice, kids love it, it gets their mind off the shots soon to come. :P
I would make it a sturdy tank, though, with a secure lid, for everyone's safety. And I don't think you should attempt a sorority in that situation, if something goes wrong you won't find out about it until the next time you visit.
Robert Falcon Scott - Red salamander HM plakat
Passed on- Friedrich "Freedy"
Four African Dwarf Frogs - Dorkus, Sporkus, Baron(ess), and Bubbles!