Trigger in sps dominated tank

[reef bound]

We have a niger trigger in our 180g right now. We got him about a year ago and in that year he has grown from about 2 1/2 or 3" to about 7". (He's going back to his 220g original home shortly). We have a few pieces of sps, but other than an accidental fragging of the green digi, he doesn't bother with nipping anything. He does take the odd snail for a ride, though. Picks them off the wall every so often, swims around with them in his mouth for a bit, then drops them. Also, he moves frags around if they're not glued down. He's really quite the character. Beautiful fish.
We also have a coral beauty angel and I haven't noticed any nipping from him. A model citizen for about a year now. I find he isn't as social as other fish, but nonetheless, a nice splash of color.
We've got 3 clams in the tank also, and neither fish bother them.