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Eastern Triangular Butterflyfish (Chaetodon baronessa)

Find Eastern Triangular Butterflyfish across reef-livestock retailers and from fellow hobbyists on ReefDock. Compare sources, check live pricing where available, and review source-tank parameters on Reef-Trak-verified fish listings before you buy.

Eastern Triangular Butterflyfish
Photo: Diego Delso · CC BY-SA 4.0
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Where to buy Eastern Triangular Butterflyfish

ReefDock searches the following reef retailers for this fish. Click through to see the live price.

  • Saltwaterfish

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  • Amazon

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  • Petco

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About Eastern Triangular Butterflyfish

Chaetodon baronessa displays the distinctive triangular body shape characteristic of butterflyfish, with a yellow-gold coloration across the head, dorsal fin, and anal fin. A prominent black diagonal stripe runs from the nape through the eye, and the rear body and tail are marked with dark vertical bars and a dark posterior margin, creating a striking high-contrast pattern.

Key facts

Difficulty Level
Moderate difficulty. The Eastern Triangular Butterflyfish requires stable water conditions, a varied diet, and careful acclimation, but is more hardy than some other butterflyfish species when properly established in a mature reef system.
Diet Details
In captivity, offer a varied diet including high-quality marine flakes, small pellets, frozen mysid shrimp, and finely chopped seafood. Supplement with vegetable matter such as spirulina or nori sheets. Feed twice daily in appropriate portion sizes.
Reef safety
Reef Safe with Caution
Temperament
Peaceful
Care Requirements
• Minimum 70-gallon aquarium; 100+ gallons preferred • Temp 72-78°F, pH 8.1-8.3, SG 1.020-1.025 • Requires coral-rich reef with plenty of hiding spots • Feed varied diet: small crustaceans, copepods, mysis, spirulina • Can be aggressive toward similar butterflyfish; keep singly or as mated pair
Care Level
Moderate
Diet
omnivore
Common Health Issues
Marine velvet, ich, parasitic infections, fin rot
Origin
Indo-Pacific region from the Great Barrier Reef and Indonesia eastward to the Line Islands and Marshall Islands, primarily in tropical coral reef environments.
Family
Chaetodontidae
Water Parameters
Temperature: 72-78°F pH: 8.1-8.3 Salinity: 1.02-1.025
Min tank size
75 gallons

Looking for a hobbyist seller?

ReefDock's marketplace lets reef-keepers sell fish directly to other reef-keepers with Stripe-secured checkout and live-arrival photo confirmation. Browse current fish listings on ReefDock, or list your own.

Verify the source tank before you buy

ReefDock is the sister app to Reef Trak. Sellers who maintain a Reef Trak tank log can publish source-tank parameters on eligible fish listings — so you can see the conditions a fish was raised in before you buy. Log this fish on Reef Trak.

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