Mine recently picked up a 'slingshot maneuver'. He has two corner pieces of PVC pipe with flat slate rock on top of them. He will slowly swim into one side of the pipe, and JET out of the other, like he is being slingshotted. He'll do it over and over, sometimes swimming head-first into my plants (sometimes with a lot of force). I never thought fish could have "fun", or even knew what "fun" was until I saw him do this. It's hilarious.
