I currently feed mine a variety of snails, squid, krill, fresh shrimp, clams, and scallops...rotating around each day. It's easy to get a variety from the market and thaw accordingly each day.
IME, this is a big bodied fish that even as a juvenile does better with 2 feedings a day. But, as mentioned, it will ALWAYS appear hungry so don't fall for the begging! A picture is available in my gallery.