Mine was an excellent, likable fish with a VERY healthy appetite. (Watch your fingers!) Unfortunately, he became very unhappy in my 400 gallon reef and began to pace relentlessly back and forth along the 6 foot front panel whenever I was NOT feeding.
As the tank is acrylic, his rough skin and repetitive pacing began to scratch the acrylic very badly. I donated him to the local public aquarium and he will be living in their 12,000 gallon display.
I don't know if I just got a bad fish...or if he was captured too late in his life to adjust to captivity...or if this is how they begin to behave when they reach adulthood. (he was over 6")
Reef safe? Absolutely. Never touched a hermit crab, coral, clam and was peaceful to every other fish....but he was not happy in my 400 gallon. I can recommend them to anything but the absolute largest of tanks.