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Copperband Butterflyfish

Chelmon rostratus

AnimaliaChordataActinopterygiiPerciformesChaetodontidae

📍 Indo-Pacific

Ask Finn

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.

Size8"
Min Tank75g
peaceful
Zonemid

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.

Common Diseases

Ich (Marine Ich)

Symptoms

White spots on body and fins, rapid breathing, flashing against rocks

Treatment

Quarantine immediately; use copper-based treatments or hyposalinity therapy; maintain temperature at 28°C to speed lifecycle

Head and Lateral Line Erosion (HLLE)

Symptoms

Pitting or erosion on head and lateral line; caused by poor nutrition or water quality

Treatment

Improve diet with varied frozen foods rich in vitamins; perform regular water changes; supplement with quality marine vitamin preparations

Fin Rot

Symptoms

Frayed or deteriorating fins; discoloration at fin edges

Treatment

Improve water quality with frequent partial changes; ensure excellent filtration; treat with antibacterial medication if severe

Feeding Refusal / Starvation

Symptoms

Weight loss, lethargy, refusal of all foods offered

Treatment

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

Stats

Community tips0
Kept by0 hobbyists