Fox face vs power head

[Coralgurl]

Trying to get some pics of new fish, notice the fox face is missing. He's been hanging in the right side of the tank near the power head, well I found him stuck to it. Thought he was dead, turned the ph off and he swam away. Looks like some of his scales have rubbed off. What can/ should I do? I'm tempted to put him in the smaller tank for a while so he is not chased off by the aggressive eaters but not sure if this will stress him more.