I have one of those. They are pritty cool fish, but mine has turned into a fat ass that just lays on his side till feeding time. He's the smartest fish in my 55 gal. When there is food in the tank he swims to the top and splashes like an idiot. It scares the other fish and then he eats the food while they hide. He also loves Hikari sinking pellets, clicks like crazy when he gets them.
Anybody know how large they get, mine's about 5" now.