i had one in my reef for a long time and as juvies he was fine once he got to full grown status he started bullying other fish for food and he would eat any cleaner shrimp or harass all the crabs and snails. so coral safe yes but not invert or even small fish once they get fullgrown....if i hadnt of gotten rid of mine i know he would of eaten small fish sooner than later hes taken quite a few nips from my puffer, and fights with my clowns and damsel
overall though i would add one again in a heartbeat beautiful fish who didnt really cause m,e any grief
i posted the same thread when i got mine and was told also that it was hit or miss especially with shrimp
they do love their shrimp