Copperband Butterfly

Often chosen for pest control in reef tanks, the Copperband Butterfly (Chelmon rostratus) spends its day picking through rockwork for small prey and may help reduce Aiptasia in established systems. It has a long, narrow snout and bold copper-orange vertical banding over a bright body, with a dark eyespot near the rear dorsal area.

What You’ll Observe:

• Slow, methodical “hunting” as it probes crevices with its beak-like mouth
• Repeated patrol routes around live rock and along the front glass
• Short bursts of swimming between inspection stops, then hovering to peck again
• More confident feeding when food is placed into rock gaps or a feeding station
• Periods of focused picking at specific spots (often where pests or worms are present)

To succeed, provide mature live rock with lots of natural grazing surfaces and open lanes for cruising. Offer small meaty foods multiple times daily (mysis, finely chopped clam or mussel, and other soft marine fare), and present some of it in crevices so it can feed in a natural way. Maintain a calm feeding environment so it has time to eat without being rushed.

Will it eat frozen mysis right away, or does it need “training”?
Many settle in faster when frozen foods are presented in a way that mimics hunting—pressed into rock crevices or offered from a Copperband feeder/feeding station.

If it clears the Aiptasia, what should I feed long-term?
Plan on a consistent routine of small meaty foods (like mysis and chopped clam/mussel) so it doesn’t rely on pests as its main food source.

Is it normal for a Copperband to pace the glass or follow reflections at first?
It’s commonly observed during the first days as it maps the tank and reacts to its reflection; steady routines and a consistent feeding spot usually help it focus on foraging.

How do I keep tankmates from interrupting it at feeding time?
Using a dedicated feeding station, turning flow down briefly, and feeding a little in multiple spots can help it get a full share without competing head-to-head.

Do they actually use their snout to pull food from tight spaces?
Yes—many owners notice they feed best when food is tucked into holes or gaps, because that matches how they naturally probe rockwork for prey.

Shipped with pure oxygen and temperature control so it arrives stress-free and ready to eat.