my red tail is quiet the little what time he isnt being mean he is one of the 2 all day long at nite is when mine gets in to his prowling he chasing the rest of the fish all nite long but I love him he is a trip to watch.cat fish crazy said:Yep its quite normal,they are cave dwellers and unless they see another fish of similar shape or colouring in their territory are quite happy just to sit in their cave.