Scott I have a small (3") Niger trigger in my 44g cube tank. So far he has not bothered any of my coral - I don't think they will actually pick at it but they are famous for rearranging rock etc. so may do damage this way - or any of my inverts such as snails or shrimp. That doesn't mean he won't as he gets larger.
I absolutely love Clown triggers but my understanding is that they are a big bad ass fish that will not hesitate to kill and eat any other fish in the tank that can't stand up to them. I know that I have seen them in LFS actually attacking the glass if someone was standing outside of their tank. They also get quite big and the bigger they get the meaner they get. Maybe someday I will turn my 230 into a FOWLR and I will get a Clown Trigger.
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