I've had 2 over the past couple years and have always been great fish. Colorful,non aggressive and an algae grazer.never nipped at anything he shouldn't
I was a little nervous as well, but mine always goes into hiding as soon as I start to put my hand into the water. I just make sure I am on alert of where he is hiding when I do have to put my hand in there for any reason. They seem to be very skittish fish.
I got a one spot recently and he is in QT, so I cant comment on coral compatibility. But he made me nervous at first because, although I heard they were skittish fish, he would always swim right up to my hand when it was in the tank because he came to see it as the life-giving source of nori. Goes crazy for the stuff. He has never stung me, but im sure it will happen at some point.