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Whitemargin Unicornfish (Naso annulatus)

Find Whitemargin Unicornfish 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.

Whitemargin Unicornfish
Photo: Jens Petersen · CC BY 2.5
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Where to buy Whitemargin Unicornfish

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 Whitemargin Unicornfish

A large, robust unicornfish (tang) with a grayish to silvery body and distinctive white-bordered pectoral fins (giving it the "whitemargin" common name). Adults develop a prominent bony frontal protuberance and elongated snout typical of Naso species.

Key facts

Care Requirements
• Requires 250+ gallon tank with excellent water flow • Prefers cooler temps (72–76°F), high-quality water params • May nip at soft corals and ornamental invertebrates • Heavy feeder; varied diet of nori, frozen foods, quality pellets • Becomes territorial and aggressive with congeners as it matures
Diet Details
In captivity, feed a varied diet of high-quality marine flake, pellets, and frozen foods (mysis shrimp, brine shrimp) supplemented with vegetable matter, including nori and spirulina. They graze on algae in the aquarium and benefit from regular vegetable offerings.
Reef safety
Reef Safe with Caution
Appearance
A large, robust unicornfish (tang) with a grayish to silvery body and distinctive white-bordered pectoral fins (giving it the "whitemargin" common name). Adults develop a prominent bony frontal protuberance and elongated snout typical of Naso species.
Common Health Issues
Marine ich, Fin rot, Swim bladder disorder, Hole-in-the-head disease, Velvet disease
Water Parameters
Temperature: 72-79°F pH: 8.1-8.3 Salinity: 1.02-1.026
Max Size
20
Aka
White Margin Unicornfish
Family
Acanthuridae
Feeding Schedule
Feed 2-3 times daily
Origin
Indo-Pacific from the Red Sea and East Africa to Hawaii and French Polynesia, typically found on outer reef slopes and in areas with moderate to strong currents.
Care Level
Expert

Looking for a hobbyist seller?

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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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