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Copperband Butterfly (Chelmon rostratus)

Copperband Butterfly

Chelmon rostratus
Family
Butterflyfish / Chaetodontidae
Care level
Advanced
Temperament
Peaceful
Reef safe
Reef safe with caution
Max size
20 cm
Min tank
400 L · 106 gal
Origin
Indo-Pacific
Diet
Carnivore
Food
Mysis, Brine shrimp, Live black worms, Frozen carnivore blends

Overview

The Copperband Butterfly is a strikingly patterned fish with vertical orange-and-white banding and a long, slender snout adapted for picking food from tight crevices in rock and coral. It's prized for its potential to eat pest anemones such as Aiptasia, though this behaviour varies significantly between individuals and shouldn't be relied upon as a guaranteed solution.

Unfortunately, it's also one of the more challenging butterflyfish to keep long-term, with a well-known tendency to be a slow or selective feeder after import, sometimes leading to gradual decline if it doesn't transition onto a reliable diet.

Success with this species depends heavily on sourcing a specimen that's already eating well, along with a mature, established tank offering plenty of natural foraging opportunities in the rockwork.

Compatibility

Copperband Butterflies are peaceful and generally coexist well with a wide range of community fish, including tangs, wrasses, and gobies. They rarely show aggression toward other species.

Reef compatibility is inconsistent — many individuals leave stony and soft coral alone, but some will pick at LPS polyps or clam mantles, so this species is rated reef safe with caution. Its potential to eat pest anemones is a genuine plus for reef keepers dealing with an Aiptasia outbreak, though not a guaranteed behaviour.

Health & quarantine

This species carries meaningful feeding risk, and a minimum four-to-six-week quarantine with close feeding observation is strongly recommended. Buying only from a supplier who has confirmed the specific fish is already eating a variety of foods significantly improves the odds of long-term success, since wild-caught individuals that don't transition onto prepared foods within the first few weeks often decline.

Frequently asked questions

Will a Copperband Butterfly eat my Aiptasia?
It may, and this is one of its main appeals, but not every individual will reliably do so, so it shouldn't be relied upon as a guaranteed solution.
Why is the Copperband Butterfly considered difficult?
It has a reputation for being a slow or selective feeder after import, and some individuals fail to transition onto prepared foods.
What should I check before buying a Copperband Butterfly?
Confirm with the supplier that the specific fish is already eating a variety of foods before purchase.
Is the Copperband Butterfly reef safe?
Rated reef safe with caution — most leave coral alone but some individuals nip at LPS polyps or clam mantles.
How big does a Copperband Butterfly get?
Around 20cm, requiring a well-established, moderately large tank.

Care guidance is drawn from our own experience — every fish is an individual, so treat it as a starting point, not a guarantee. Not sure if a species suits your tank? Come ask us in store. New to the terms? Read the care-terms glossary.