I loved my SFE. I had him for over 2 years. He went from about 1.5 inches to about 24 inches and always ate frozen. He was in a reef tank and I had no problems with snails or crabs. He was fed very well; silversides, squid, krill, etc. One day, I came home from work and the following were MIA; Coral Banded Shrimp, Fire Shrimp, Bicolor Blenny, Percula Clown, Dragonet and a Firegoby. The only thing left were the claws from the CBS. That weekend I sold him.
Also, don't feed him goldfish. It makes them sick. It's like eating McDonalds!