Chaetodon bennetti is among the more striking members of its genus, carrying a clean yellow body marked by a blue-edged black bar through the eye and a large blue-edged black patch high on the rear flank. Two pale to vivid blue curved lines sweep across the lower side, giving the fish a distinctive pattern that holds from juvenile through adult stages. The species ranges broadly across the Indo-Pacific, from East Africa through the central Pacific, where it occupies coral-rich lagoons as well as seaward and outer reef slopes. Juveniles shelter within dense branching Acropora thickets, while adults grow to roughly 7.9 inches in total length.

Adult housing should begin at 60 gallons, though larger volumes are preferable and several references point toward 70 to 75 gallons as a practical starting point. The aquarium must be fully established and mature, with generous open water for cruising and substantial rockwork that supplies both shelter and grazing surfaces. A fish-only system stocked with non-aggressive companions is the appropriate setting, since this butterflyfish consumes live coral and will not coexist with a stony coral display. Care level is moderate in the sense that water quality and layout are straightforward, but the specialized feeding requirements and historically poor captive survival make this a fish for seasoned or professional keepers rather than a casual addition.

On the reef, Bennett's Butterflyfish feeds predominantly on live coral polyps, and some accounts describe the diet as very nearly exclusive to coral tissue. Algae have also been reported as a dietary component, and broader references classify the species as omnivorous, but coral remains the principal food in the wild. This degree of specialization is the central husbandry obstacle, because newly imported specimens frequently ignore conventional aquarium fare and can decline rapidly.

Acclimation should rely on foods that mimic soft, fleshy, attached prey. Live fortified brine shrimp, blackworms, opened clams or mussels, and chopped squid or krill pressed into rock crevices or onto bare coral skeleton are the most reliable starting points. Offer small portions several times each day so the fish has repeated opportunities to sample and so no individual meal is lost to competitors. Even with diligent effort, conversion to substitute foods is not guaranteed, and a keeper should be prepared to sustain an intensive feeding regimen indefinitely.

Live Fortified Brine Shrimp Blackworms Opened Clams Mussels Chopped Squid Chopped Krill Small Live Clams
Wild adults are encountered singly or in pairs, and the aquarium temperament reflects that solitary habit: shy, peaceful, and inclined to retreat into rockwork when startled. Given adequate volume and structure, this fish settles into steady daytime cruising along the reef face. Butterflyfish confined in quarters that are too small may begin defending territory, so honoring the space and layout recommendations helps preserve the calm disposition. Timid tankmates such as small wrasses, gentle basslets, and other non-aggressive reef fishes suit it well, while boisterous or fast-feeding competitors should be avoided because they will outpace it at mealtimes and worsen an already difficult feeding situation.

This species is not reef safe. Coral polyps are a primary natural food, and stony corals are particularly vulnerable to persistent grazing. Clams are also at risk, to the extent that small live clams are sometimes offered deliberately as food. Members of the genus Chaetodon may additionally pick at crustaceans, so ornamental shrimp and crabs warrant caution. The most dependable arrangement is a fish-only aquarium where sessile invertebrates are absent and feeding attention can be focused entirely on the butterflyfish.

FAQ

Frequently Asked Questions

About the Bennett's Butterflyfish

  • Can Bennett's Butterflyfish be kept in a coral reef aquarium?
    No. Live coral polyps are its principal natural food, and stony corals in particular will be grazed, so it belongs in a fish-only system.
  • Why is this butterflyfish considered a challenge to maintain?
    It is an extreme feeding specialist that often refuses ordinary aquarium foods and may decline even when appropriate substitutes are offered, which demands an experienced keeper and a persistent feeding routine.
  • What kind of aquarium should be prepared for an adult?
    Plan on a mature, peaceful fish-only tank of at least 60 gallons, with open swimming space and substantial rockwork for shelter and grazing; larger volumes in the 70- to 75-gallon range are preferable.