Chaetodon sanctaehelenae also commonly referred as Saint Helena butterflyfish lives endemic in the tropical waters of Ascension and St. Helena Islands. Common in shallow waters. Usually observed in pairs or large groups.
Called a cunning fish since it can nibble the bait from a hook without taking the hook into its mouth. The juvenile Thalassoma sanctaehelenae has been observed cleaning the cunningfish of its parasites.
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.