New Clown being Chased by other fish

I recently introduced a new clown fish into my 75 gal FOWLR.
In the tank I also have :
2 other Clown Fish
4 damsels
4 worm gobys
1 Coral Beauty Angel
1 Powder Blue Tang.
When I placed the newest Clown in the tank, the Powder Blue, Clowns
and some of the damsels began to attack the new clown. I found him a
day or so later hidding in the corner under a piece of LR. He won't
come out.

A friend of mine suggested rearranging the rock around because the
fish become teritortial and this will put all the fish on equal
footing, so to speak. I'm lookng for suggestions to help the new
clown in the tank.
Thanks