Three Band Pennant Butterflyfish (Heniochus Chrysostomus) saltwater aquarium fish

The Three Band Pennant Butterflyfish (Heniochus chrysostomus) is a laterally compressed, white-bodied butterflyfish crossed by three broad oblique dark brown bands: one running through the eye to the abdomen and ventral fins, a second sweeping from the dorsal fin to the anal fin, and a third alongside the dorsal fin. Yellow washes the mouth, the top of the snout, and the area between the eyes, while orange-yellow tones carry through the posterior dorsal fin, the caudal fin, and the pectoral fins. Juveniles are easily distinguished by a longer, narrower dorsal pennant filament and a double ocellus, a black spot rimmed in orange-yellow, on the anal fin. Adults reach roughly 7 inches.

This species ranges widely across the Indo-Pacific, from Western India east to the Pitcairn Islands, north to southern Japan, and south to Rowley Shoals, southern Queensland, and New Caledonia. It occupies coral-rich reef flats, lagoons, and seaward reefs between about 2 and 60 meters, with juveniles typically solitary in estuaries and lagoons and adults most often encountered in pairs.

Plan on a 125-gallon aquarium or larger for an adult. Build a rocky aquascape with live rock arranged into overhangs and caves for shelter, but keep the layout open enough to preserve substantial swimming lanes, since this is an active fish that makes full use of horizontal space. It can be maintained singly or as a pair, provided both individuals are introduced at the same time. Small, docile tankmates make the early weeks easier and help a new arrival settle in and begin feeding.

On the reef, Heniochus chrysostomus feeds primarily on coral polyps, which explains both its specialized feeding behavior and its tendency to sample sessile invertebrates in captivity. This is an omnivore in the aquarium and should receive a broad menu: herbivore preparations and algae-based foods alongside meaty items such as mysis shrimp, brine shrimp, and finely chopped seafood, rounded out with quality flake or pellet foods.

Offer food one to two times daily once the fish is established, and several times a day while it is newly introduced. This species can be difficult to acclimate and may prove finicky at first, so live zooplankton, or soft foods pressed into rock crevices and coral skeletons, often coaxes a reluctant specimen into feeding. Once it is settled in a mature system where it can graze on natural food sources between meals, feeding frequency can be reduced.

Mysis Shrimp Brine Shrimp Finely Chopped Seafood Live Zooplankton Algae-Based Foods Herbivore Preparations Marine Flake Marine Pellets
Temperament is peaceful, and this butterflyfish largely ignores other fish, which allows several butterflyfishes to share a sufficiently large system. Avoid housing closely similar species together unless they are an established pair. Adults form pairs in the wild and will do so in captivity, and a pair can be kept successfully when both fish are added simultaneously. Small, calm tankmates are the best companions, particularly during acclimation.

Reef compatibility is the limiting factor. This species is not reef safe: it may nip at sessile invertebrates and corals, including LPS and SPS corals as well as soft corals, and it will nibble at clams such as Tridacna species. House it in a fish-only system with live rock, or accept meaningful risk to valuable coral and invertebrate stock. Snails, ornamental shrimp, and other small invertebrates may also draw its attention.

FAQ

Frequently Asked Questions

About the Three Band Pennant Butterflyfish

  • Can the Three Band Pennant Butterflyfish be kept in a reef aquarium?
    No. It may nip at corals, including LPS, SPS, and soft corals, and will nibble at clams such as Tridacna species, so a fish-only system with live rock is the appropriate home.
  • How large should the aquarium be for an adult?
    A minimum of 125 gallons is recommended, with a rocky aquascape providing caves and overhangs plus generous open water for this active swimmer.
  • Is this butterflyfish suitable for a first saltwater aquarium?
    It is rated moderate in care and can be a finicky feeder that is slow to acclimate, so it suits intermediate aquarists best. Frequent, varied feedings during the introduction period improve the odds of success.