I have a mixed reef tank that currently had 4 fish. A large 8 inch sohal tang a 5 inch yellow tang and a 3 inch tomato clown. I recently bought a 3 inch Hippo tang from a fellow NJReefer. I kept it in QT for 3 weeks . Today I added to the DT and then feed all the fish the hippo joined right in with the feeding no problem. after the feding a few minutes later the sohal tang began to chase the much smaller hippo all arond. It seemed to stress the hippo who is quite skitish to began with. I did not know what to do so i returned the hippo to QT. Is this expected? what shuld i do?