Phyl, still keep a watch on that tang. How big is he? If larger, I'd really watch him for agressiveness. Like I said, it may happen or it may not. Mine picked on a foxface rabbitfish (same color, similar body). Sometimes he would nip at my brittle star leg. Just once every once in while, it seemed to show who was boss. The other fish were just fine with him as quite a few came after he did.
"Life may not be the party we hoped for but while we are here we might as well dance!"