This is definitely a juvenile Queen Angelfish (Holacanthus ciliaris). I see them around the nearby coral reefs, they are a local species. This specific one may be a recent arrival due to its dull center coloration or its the yellow phase. I would not recommend this species for reef setups. They tend to nip at their surrounding areas which will include the corals and invertebrates...an extremely curious fish. I'm assuming this particular one is eating aquarium food/vegetable matter, but I would strongly advise special angelfish food which contains marine sponge. They are one of the larger Angelfish species, approaching 18-20 inches. Also, these fish become aggressive with age, even if they act as cleaner fish when they are juveniles. Their appearance will change as they enter adulthood. Please, feel free to ask more questions if needed.