The Sunset Butterfly (Chaetodon pelewensis) offers vibrant yellow-to-orange coloration with diagonal black banding that stands out in peaceful, fish-only aquariums. Many aquarists search for Sunset Butterflyfish tank size or want to confirm if the species is reef safe, and this fish performs best in systems without corals or invertebrates. Its predictable behavior, calm swimming style, and compatibility with peaceful tankmates appeal to aquarists moving into more advanced species. 

Appearance

The Sunset Butterfly has an oval, laterally compressed body shaded in golden yellow to orange with diagonal black bands, a dark forehead patch, and a bright orange eye bar edged in black. Thin yellow fin outlines highlight its smooth, streamlined shape.

Care & Requirements
The Sunset Butterfly thrives in stable fish-only systems with mature filtration and ample rockwork. It is not reef safe because it naturally consumes coral polyps and benthic invertebrates. A 70-gallon tank provides room for confident swimming, and feeding should include frozen mysis shrimp, brine shrimp, and enriched foods. Offering food two to three times daily supports consistent appetite and acclimation.

Is the Sunset Butterflyfish hard to care for?
It is moderate to expert level because it needs stable water conditions, structured feeding, and time to adjust.

Does it eat coral in aquariums?
Yes, it consumes coral polyps and should not be kept in reef tanks.

How often should it be fed?
Two to three feedings per day help maintain body condition.

Tank Mates & Compatibility
This species mixes well with peaceful fish such as smaller angelfish, wrasses, anthias, and calm tangs. Avoid aggressive tankmates and other butterflyfish with similar patterns. Introducing it after dominant species helps maintain social balance.

Can two Sunset Butterflyfish be kept together?
A proven pair can coexist, but unpaired individuals may become territorial.

Are they compatible with invertebrates?
No, they will pick at many sessile invertebrates.

What fish should not be kept with them?
Avoid aggressive species and butterflyfish with similar banding patterns.

Aquaculture/Availability
Currently, captive-bred Sunset Butterflyfish are not widely available, and most specimens come from wild sources. Seasonal shifts in collection areas can affect supply. Once acclimated, they adapt well to frozen marine foods.

Are captive-bred Sunset Butterflyfish available?
Not consistently; most are wild-caught.

Does wild collection affect their care?
Wild-caught fish may be shy initially but adapt with structured feeding.

Is availability seasonal?
Availability often varies with conditions in South Pacific collection zones.

FAQ
What size tank is best for the Sunset Butterflyfish long-term?
A tank of at least 70 gallons provides room for swimming and stable water quality.

Is the Sunset Butterflyfish suitable for beginners?
It is better for intermediate to advanced aquarists because it needs stable conditions and routine feeding.

What should I feed my Sunset Butterflyfish?
Offer frozen mysis, brine shrimp, enriched marine blends, and small prepared foods.

Can a Sunset Butterflyfish live with angelfish or wrasses?
Yes, it socializes well with peaceful angelfish and most wrasses in fish-only tanks.

How quickly does the Sunset Butterflyfish acclimate?
It may take a few days to explore the tank comfortably, especially if hiding spots are available.

Does the Sunset Butterflyfish change color as it matures?
Markings may sharpen with age, but overall coloration remains similar.

Can the Sunset Butterflyfish hybridize with other species?
It can occasionally hybridize with the Spot-Banded Butterflyfish in shared habitats.

How long does the Sunset Butterflyfish live in captivity?
With stable care and consistent feeding, most individuals reach 5–7 years.