Butterfly fish is one of the more difficult marine fish to keep in the home aquarium and is definitely not recommended for a saltwater beginner. Only introduce one to a long established tank (6 months or more) with peaceful tank mates. If you have a new tank and it is still going through the aquarium nitrogen cycle, you can kiss this baby good bye.Butterfly Fish are very delicate and it can be very difficult to get them eating. You may need to experiment with various live foods, including brine, mysis shrimp, frozen and freeze-dried diets containing algae are good substitutes and can be supplemented with asparagus, broccoli, and some dried algae.Another useful method to encourage some Butterflyfish to eat is to place their food inside of a coral skeleton.