Pakistan Butterflyfish

The Pakistan Butterflyfish, Chaetodon collare, is a beautifully patterned marine aquarium fish with a deep, laterally compressed body and rich brown to charcoal coloration. Each scale is highlighted by a paler center, creating an intricate reticulated pattern, while bold black-and-white facial bands produce a dramatic masked appearance. Its vivid reddish-orange caudal fin, edged with contrasting dark and pale bands, gives this species its alternate common name, the Redtail Butterflyfish.

Native to the Indo-West Pacific, this butterflyfish occurs from the Persian Gulf and Maldives eastward through portions of Southeast Asia to Japan, the Philippines, and Indonesia. Adults inhabit coral reefs, particularly reef edges and upper slopes, where they may occur in pairs or loose groups and spend considerable time browsing coral-rich structure for food.

With an adult length of approximately 7 inches, the Pakistan Butterflyfish is an elegant choice for a spacious fish-only or fish-only-with-live-rock aquarium. Its peaceful temperament toward most unrelated fish makes it suitable for many community displays, although its specialized feeding habits, potentially challenging acclimation, and natural appetite for coral polyps require an aquarist prepared to provide frequent, varied feeding.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 125 gallons
Temperament: Peaceful
Diet: Carnivore / Corallivore
Reef Safe: No
Region: Indo-West Pacific
Scientific Name: Chaetodon collare

Tank Requirements

Provide a mature marine aquarium with substantial live rock arranged to create caves, overhangs, and sheltered passages while preserving generous open swimming space. The Pakistan Butterflyfish is an active cruiser and benefits from a long aquarium with plenty of room to move comfortably between feeding and sheltering areas.

Established rockwork is particularly useful during acclimation because it provides natural surfaces for exploratory browsing. Avoid overly crowded aquascaping that restricts movement, but include enough structure for the fish to retreat when stressed.

Moderate water movement, excellent oxygenation, efficient filtration, and consistently stable water quality are recommended. This butterflyfish can be sensitive during introduction, so an established aquarium is strongly preferred over a newly cycled system.

A secure cover is advisable, especially during the acclimation period when a startled fish may make sudden movements toward the surface.

Diet and Feeding

The Pakistan Butterflyfish naturally feeds heavily on coral polyps and other small reef-associated animal matter, making successful dietary acclimation one of the most important aspects of its captive care.

Offer mysis shrimp, enriched brine shrimp, finely chopped shrimp, clam, mussel, squid, and high-quality frozen butterflyfish or marine carnivore blends. Clam or mussel presented on the half shell can be especially useful for encouraging a newly introduced specimen to begin feeding.

Once feeding consistently, quality marine pellets and frozen preparations can be incorporated for additional variety. Small amounts of spirulina-based foods or marine algae may also be accepted, but meaty marine foods should remain central to the diet.

Feed two to three times daily, with smaller frequent portions generally preferable to one large meal.

Temperament and Tankmates

The Pakistan Butterflyfish is generally peaceful toward unrelated marine fish and can be housed with many similarly sized peaceful or semi-aggressive species. Suitable tankmates can include tangs, rabbitfish, peaceful wrasses, clownfish, and appropriately compatible angelfish.

Territorial behavior is more likely toward other butterflyfish, particularly similar-looking species. A single specimen is the most straightforward choice for most aquariums.

Adults naturally form pairs, and an established compatible pair can potentially be maintained together in a sufficiently spacious aquarium. Two unrelated specimens should not simply be added together with the expectation that they will pair.

Avoid highly aggressive or extremely competitive feeders that may prevent a newly introduced butterflyfish from obtaining enough food.

Reef Compatibility

The Pakistan Butterflyfish is not reef safe. Coral polyps are an important component of its natural diet, and it may actively nip at or consume stony corals in captivity.

Soft corals, zoanthids, feather duster worms, and other sessile invertebrates may also be investigated or damaged. Clam mantles and other exposed fleshy invertebrates should likewise be considered at risk.

For predictable long-term husbandry, this species is best maintained in a fish-only or fish-only-with-live-rock aquarium rather than a coral reef display.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Stable salinity, excellent oxygenation, and consistently clean water are more important than attempting to maintain an exact value within these ranges.

Common Considerations

• Feeding acclimation can be challenging: Newly imported specimens may initially refuse prepared foods and benefit from clam, mussel, mysis shrimp, and other highly palatable marine foods.

• Not reef safe: Its natural coral-polyp feeding behavior makes stony corals and many sessile invertebrates vulnerable.

• Frequent feeding is important: Several smaller meals help accommodate the feeding pattern and metabolism typical of butterflyfish.

• Mature rockwork is beneficial: Established live rock provides shelter and natural browsing opportunities during acclimation.

• Butterflyfish aggression: Although peaceful toward most unrelated fish, territorial behavior can occur toward other butterflyfish.