Hey, you guys have got to try this. I put a golf ball in my tank a couple days ago and my P's went nuts. The dominant one would not stop trying to attack it. I had to put in another one because my other P wanted one too. Now they each have one that they've put in their territory. It almost reminds me of one time when I was young and went to the zoo here in town. There were these buffaloe there that had these huge metal balls that they pushed around all day. It looks exactly the same only the P's try to bite them. Try it out, I've had hours of amusement since I did it.