I learned a lesson the hard way when it came to tankmates for my new little hystrix ray. I looked up and picked what was recommended as good tank mates. I choose to keep one orange shoulder severum and three geo abalios. Boy was that a bad decision they nipped and spit sand at him way to much he is a little stressed and bit up. So their on a one way trip to the lfs ...it just goes to show how all fish have different behavior regardless of what people say normally would happen.