My first 2 fish were oc.clowns. They were already paired up. I have had them for about 5 months and they never left each other. One has grown double the size of the other one, so I am asuming this is the female. About 3 weeks ago I bought a baby hippo tang.(when it grows it will be going in 180g tank) Since the female clown kinda has adopted the hippo and the male clown now stays in a cave and only comes out to feed. Is this normal? Thank you