a wide variety of meaty foods and some hard shelled ones to help wear down their teeth. Some good ones are raw shell on shrimp, scalops, clam in the shell, raw shell on crab, squid, gut loaded ghost shrimp, and some silversides.
other than that and decent water quality the only requirements are that you have a large tank (about 100 gal) because they get big.
you also need to keep up with the water changes becasue they are messy eaters and can casue your parameters ammonia and nitrates to increase.