put a mirror on front of him or the tnak where is swims , i did that to my kole tang ,when i added my baby orange shoulder tang, the kole keep picking on baby Lu LU, until i left that mirror there for over a week the kole stayed in the corner trying to get at himself. and the little one got a chance to swim around and relax to the tank.. even at feeding the kole wouldnt leave the corner thinking that his reflection might get food first. It has always worked for me ...... give it a try
