I've recently purchased two tiny upside down cats and they are a really cool addition to my tank. I've also kinda funny, they are still pretty small, but the they sometimes chase the dominant fish in the tank (a beatful female betta) around the tank, although it seems to be more play than any thing else. They also seem to like to rough house with each other, chasing each others tail's around and around. And one of the them likes to wear himself out swimming against the bubbles from the bubble wall. Really neat fish.
