Mueller’s Butterflyfish

Common Name: Mueller’s butterflyfish, Blackfin Coralfish, or Muller’s Coralfish

Scientific Name: Chelmon Muelleri

Size: up to 20 cm

Distinguishing Features: Like most from the genus of Chelmon, the Meuller’s butterflyfish have an elongated tubular snout that is used to pry into small crevices looking for prey. They have four vertical bars on their body. A false-eye spot is located on the rear dorsal fin to aid in escaping predation.

Distribution: Pacific Ocean: Found exclusively near coral reefs and estuaries of Northern Australia.

Feeding Requirements: It is not difficult to imagine the feeding requirements of this species. Considered a benthic feeder its long snout is perfect for hunting small sessile invertebrates. Will nip at feather dusters and possibly will eat clams and Aiptasia. Upon receiving this species it is advisable to get it feeding on live Mysis, blood worms, or other similar food. Initially they may refuse commercial feed. Therefore they should be fed a variety of live foods and slowly converted to frozen or flakes. Nutrition is a concern with this species and a variety of foods should always be offered.
Captive Requirements: Inactive at night, this animal spends its day foraging around the open reef. In captivity this should be no different and the Mueller’s butterflyfish deserves a tank of no less than 100 US gallons (380 liters). This animal can reach sizes of 8 inches and ideally should be kept in 150 US gallon aquariums or larger (570+ liters).

Reef Tank Compatibility: This fish fits the profile of many Chelmon species. It should be introduced with caution similarly to that of Chelmon rostratus (Copperband butterflyfish) and Chelmon marginalis (Margined Coralfish). The Mueller’s butterflyfish is a model citizen. Similar to that of the Copperband, they are shy and timid feeders. When housing with larger more aggressive species, it is advisable to introduce these animals first. . The most difficult aspect of this specie is having it feed regularly when initially received. Once established and regularly feeding in a stable high-water quality aquarium they will last for many years.