Like Bryan said, I'd vary the foods for him so he doesn't get into a rut with insufficient nutrient. I'm not sure there is a good answer on how much to feed... I tried to feed him about half as much as he wanted food

. On a krill example, I would give him 3-4 pieces of frozen or freeze dried krill at one sitting, then small amounts of something else hours later. Sometimes, he only got a single serving of anything per day. I'd try to stick with marine fish, as they have more of what he needs than freshwater fish. Silversides, squid, etc. Anything kinda big and meaty. Be careful with items that may have potentially been frozen and thawed.
I've heard lions and clowns are in the Caribbean (the lion article I saw was in NC), but I've not seen any. I think it's a shame that so many non indigenous species are making it into Caribbean waters. Species being where they aren't supposed to be creates problems worldwide... If they are naturally redistributing themselves, its one thing, but if this is due almost solely to the hobby, we need to start policing each other.