Need fish ID please

[Reef_kid]

i had one of these guys i got it when it was an inch long:P
i thought it had died ..... 3 years later i found that he had gotten into my sump and had been hidding under rock for years.. grew to about a foot long and was about as thick as a thumb.... odd fish.
they are not nice if you have lots of rock work they tend to dig and everything tumbles down...