Niger triggerfish reef safe?

[ALang]

Ugh-oh! I just added a niger into my reef. It has clams and cleaner shrimps.
So far he's good, but he's only a couple of inches long. He's "rooming" with the cleaner shrimps in the same mound of live rocks. He gets the "kiss" marks from my large algae blenny ( I think that the blenny wants to evict the trigger).

So feed him frozen clams?? Like mussels, to wear down his teeth?
He's eating flakes (Formula One and Two), pellets, mysis and nibbles on the romaine lettuce that I left for my tangs.

I am now praying to the fish gods for a good trigger.