They are really nice fish, but shy like most from the foxface family.
I've haven't been stung by anything in my tank, something I'm pretty careful about. I never had to worry before as this guy was so shy he would disappear all the time, but now he is more friendly and comes in for a visit once in awhile. (while my hands are in the tank, or during feeding)
The above picture looks different than mine probably because these fish change colors so often. (whenever they are not feeling normal) ie. scared. They will turn black, or a motled grey/black spotted pattern. It's pretty cool.
Mine is just over 5" and I've had him for 15 months or so.