I feed him Formular I & II plus pieces of shrimp and clam. They usually hang out on the bottom of the tank and looks for things to eat in the sand, some will even blow the sand around to try and find some thing to eat. I also feed a marine pellet type food, either Formular I or Spectrum, which sinks to the bottom and keeps them busy.
For the size it can get, about 2', it's not a very aggressive fish and other fish can take food away from it, so I usually feed the tank first and then him after.