I have a blue throat in my reef. - I'm going to be posting pictures in a few minutes. - Back to the point. - He doesn't touch my verts or my corals. - He is an outstanding member of the reef community.
I also have a very strange reef though.
I have a Eel - Blue ribbon eel
I have a Lion - Fuzzy Dwarf
I have a trigger - Blue throat
All of which are " NOT " reef safe. - They dont bother anything in my tank. - Mind you I have no small fish with the exception of a few damsels...but they dont mind hurt anything.
Based on my experience *I could be wrong* its a mixture of set up and luck of the draw. - However something tells me if I have 3 predators in my tank, and non of them bother my fish or corals... that it comes down to set up and layout.
I'd add one if you want one. - Worst case you catch it and bring it back to the store.