I have two triggers in my reef tank - along with two anemones, several SPS corals, cleaner shrimp, snails, tangs, clowns, etc. A blue jaw and a sargassum trigger. Nigers are 50/50. My brother has one in his reef and has been ok so far but he is small. Pink tails often work as well. In my opinion look for one of the triggers from the xanthichthys family - crosshatch, bluejaw, sargassum.
Big key - get them as small as possible and introduce last.