The correct water perameters, no toxic levels of anything and proper lighting are all it really needs. It will get food particulates from your water column when you feed your fish and corals.
It wouldnt hurt to feed it small chopped pieces of raw marine foods now and then. If you want you can soak the food in selcon or superselco which are vitamins and omega3 fatty acids. But if your animal is healthy this isnt a necessity.