yep^^^ I raised up a group of 5 and randomly lost 3 of them to ick within 3-4days. Luckily the biggest male, and the nicest female survived. Then when I finally had my male and female alone he took half of her tail off, I'm waiting for her to get bigger so I can try breeding them again. Like I said though, there will probably be a dominant one that will chase everybody around the tank all day. They're no match for even a convict IMO but they can do some damage to their own species.