Joker to answe your question, no they dont fight at all they usually stay at opposit ends of the tank, but a few times ive caught them hanging out together, not fighting at all. And Thanx Snipe, im so much happier witht he sand, did you see the before and after pics i took a while back?? If you didnt let me know ill post the before pic for you again, its amazing how much better it looks. Tahnx again to you both. Todd