What kinds are best?
Bluethroat, Crosshatch, Sargassum (Xanthichthys) these are the three I would look at if you want to add one to your reef tank, keep in mind a trigger is a trigger, they require room to swim, space to establish territory and are waste makers.
I did not add the Niger or Pinktail, as juveniles they are great, it is when they mature you may see issues, more with these two than the Bluethroat, Crosshatch or Sargassum.
Kaye