Never heard of this but tonight i walked in to turn my light off on the tank and saw one of my clown loaches dead. It had clearly clown loach bites all over it. So i sat and watched the remaining 3 loaches and one clearly the biggest had 2 bite marks on it. I have seen a video clip of clown loaches have a niggel but never dieing. Anyways i am coming to the conclusion that they fought. What do you think??