Saltwater Fish
Eastern Triangle Butterflyfish

Species Description…

Scientific Name: Chaetodon baronessa
Common Name: Eastern Triangle Butterflyfish
Species Group: Butterflyfish
Habitat: Fish Only
Care Level: Advanced
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 6 (inches)
Min Aquarium Size: 75 (gallons)
Native Range: Indo-Pacific
Chaetodon baronessa - Eastern Triangle Butterflyfish

Chaetodon baronessa (Eastern Triangle Butterflyfish)

Overview

  • Native to the Indo-Pacific, commonly found in coral-rich lagoons and reef slopes.
  • Identified by its pale yellow body with diagonal dark stripes and a prominent black band covering its eyes.
  • A delicate species that requires a well-maintained aquarium with stable water parameters.
  • Typically found in pairs or small groups in the wild, making it a social species.
  • Best suited for an experienced aquarist due to its specialized diet and reef-dependent nature.

Feeding

  • Obligate corallivore, primarily feeding on coral polyps in the wild.
  • In captivity, it requires a diet rich in sponge-based foods, frozen mysis shrimp, and marine algae.
  • May be difficult to acclimate to prepared foods, requiring patience and careful feeding strategies.
  • Frequent small meals throughout the day help mimic its natural feeding habits.
  • A well-balanced diet helps maintain its vivid coloration and supports long-term health.

Habitat

  • Typically found in coral reefs with abundant Acropora corals, where it feeds and shelters.
  • Prefers clear, well-oxygenated waters with moderate current flow.
  • Aquarium setups should include live rock and coral structures to provide hiding spaces and grazing areas.
  • Thrives in pristine water conditions, requiring an advanced filtration system.
  • Avoiding aggressive tankmates ensures a stress-free environment for this species.

Fish Care

  • Optimal water temperature: 75-82°F (24-28°C) for maintaining overall health.
  • Recommended pH range: 8.1-8.4, with a salinity level of 1.020-1.025.
  • Requires high-quality water conditions with frequent water changes to remove waste buildup.
  • Due to its coral-feeding nature, it may not be suitable for artificial reef aquariums.
  • Providing an enriched environment with corals helps encourage natural foraging behavior.

Compatibility

  • Generally peaceful but can be territorial towards other butterflyfish.
  • Compatible with tangs, wrasses, and other non-aggressive reef fish.
  • Not reef-safe, as it actively feeds on live corals, making it unsuitable for reef tanks.
  • Should not be housed with highly aggressive species that could stress or harass it.
  • Keeping in pairs or small groups may reduce stress and encourage natural behaviors.

Aquarium Behavior

  • An active swimmer that prefers open spaces with access to coral formations.
  • Frequently observed picking at rock formations and searching for food.
  • Can become stressed in confined spaces, requiring a well-structured tank setup.
  • Providing live rock formations encourages natural grazing behavior and reduces stress.
  • Over time, it may become accustomed to its caretaker and exhibit interactive behaviors, particularly during feeding times.