I have gone nuts with tropical fish.
I have a 1ft tank, 3 by 18" tanks, a 20" tank, a 2ft tank, 2 by 3ft tanks, and the latest which I haven't even filled with water yet is a 4ft tank. Oh, and a pond.
Fish I have are 20 firetail gudgeons, 4 clown loaches, 4 kuhlie loaches, 3 sydontis...