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Copperband Butterflyfish
Chelmon rostratus
Animalia›Chordata›Actinopterygii›Perciformes›Chaetodontidae
📍 Indo-Pacific
Stunning butterfly with orange-copper vertical bands and a long beak for probing crevices. Popular for eating Aiptasia pest anemones in reef tanks. Notoriously difficult to acclimate — refuses dry food and needs live or frozen worms.
Care Guide
Diet
Copperband Butterflyfish are obligate carnivores that require live or frozen foods and refuse dry pellets or flakes. Feed small frozen foods such as mysis shrimp, brine shrimp, and copepods once daily. They will also consume small crustaceans and may pick at Aiptasia anemones, making them valuable for reef pest control.
Behavior
This species is generally peaceful and non-aggressive toward other fish, though it can be shy and reclusive during acclimation. It spends much of its time probing crevices and rockwork with its elongated snout searching for small invertebrates. Once established, it becomes more active and confident, displaying its striking copper-banded coloration.
Breeding
Breeding Copperband Butterflyfish in captivity is extremely rare and has not been reliably achieved in home aquariums. They require very large systems with specific environmental conditions and larval rearing capabilities that are impractical for most hobbyists. All specimens in the aquarium trade are wild-caught.
Tank Mates
Similar peaceful temperament and reef-safe; compatible water parameters
Peaceful reef fish with matching salinity and temperature requirements
Small, peaceful, and reef-safe; may even provide cleaning services
Peaceful bottom-dweller that occupies different tank zones
Reef-safe invertebrate; may help with parasites and algae
Reef-safe and may help control Aiptasia alongside the butterflyfish
Common Diseases
Ich (Marine Ich)
White spots on body and fins, rapid breathing, flashing against rocks
Quarantine immediately; use copper-based treatments or hyposalinity therapy; maintain temperature at 28°C to speed lifecycle
Head and Lateral Line Erosion (HLLE)
Pitting or erosion on head and lateral line; caused by poor nutrition or water quality
Improve diet with varied frozen foods rich in vitamins; perform regular water changes; supplement with quality marine vitamin preparations
Fin Rot
Frayed or deteriorating fins; discoloration at fin edges
Improve water quality with frequent partial changes; ensure excellent filtration; treat with antibacterial medication if severe
Feeding Refusal / Starvation
Weight loss, lethargy, refusal of all foods offered
Offer live foods (copepods, amphipods) to trigger feeding response; minimize tank stress; ensure adequate hiding spaces during acclimation
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Quick Facts
- pH
- 8.1–8.4
- diet
- carnivore/worms/live prey
- maxSize
- 8 inches
- salinity
- SG 1.020–1.025
- minTankSize
- 75 gallons
- temperature
- 75–82°F (24–28°C)
Temperature
75–82°F
24–28°C