Very special thanks for the first and wonderful photo of the Easter Island butterflyfish (Chaetodon litus) to Zachary Ramwa from Mississauga, Canada.
Zachary Ramwa has take a photo that shows a group of the Easter Island butterflyfish feed on a seaurchin.
Chaetodon litus, also known as the Easter Island butterflyfish lives endemical on the Eastern Island reefs and is to be found in algal covered rocky reefs. Juveniles in tide pools, observed to pick bodies of other fishes for parasites.
Even if you can find them in your local shop, you may want to pass on this butterfly fish. Its Red List status is D2; please keep them out of your aquarium.
Butterflyfish are not recommended for reefs as they will pick at or eat a wide variety of corals, fan worms, and other invertebrates. Most Butterflyfish are known to pick at Aiptaisia, a parasitic anemone.