This is (or rather was) "The Big Lebowski". He was one of the best fish I ever had. He, along with all his tankmates, died when a RIO pump shorted and electrocuted the entire tank.
This guy was in a 125 gal fish-only. I got disgusted after the rio killed everything, so tore the tank down and let it sit in the garage. Just set it up again this past summer as my reef.