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Lavendar Tang (Acanthurus nigrofuscus (commonly sold as Lavender/Brown Tang))

Lavendar Tang

Acanthurus nigrofuscus (commonly sold as Lavender/Brown Tang)
Family
Tang
Care level
Intermediate
Temperament
Semi-aggressive
Reef safe
Reef safe
Max size
21 cm
Min tank
400 L · 106 gal
Origin
Indo-Pacific
Diet
Herbivore
Food
Nori, Marine algae, Herbivore pellets, Spirulina, Vegetable frozen blends

Overview

The Lavender Tang is a soft brown-grey surgeonfish with a subtle lavender-blue sheen and fine dark speckling, offering a more understated look than some of the flashier tangs. It's a solid, reliable algae grazer that adapts well to a range of tank sizes given adequate swimming room.

As with all Acanthurus tangs it needs strong water flow, established rockwork, and a diet centred on marine algae to thrive long-term, doing best in a mature, well-established system.

It's a good mid-difficulty option for keepers wanting an active, hardy tang without the more demanding requirements of species like the Powder Blue Tang.

Compatibility

Lavender Tangs can be territorial toward other tangs, particularly similarly shaped Acanthurus species, so care with stocking order matters in tanks with multiple surgeonfish. They're generally peaceful with unrelated community fish.

This species is fully reef safe and won't bother corals, clams, or invertebrates.

Health & quarantine

A minimum four-week quarantine is recommended given general Acanthurus susceptibility to marine ich, with attention to appetite and breathing in the first two weeks. Strong water flow and stable water quality support long-term health, and a varied algae-rich diet helps maintain condition.

Frequently asked questions

How big does a Lavender Tang get?
Around 21cm as an adult, requiring a large, well-established tank.
Is the Lavender Tang reef safe?
Yes, it's herbivorous and won't bother corals or invertebrates.
Is the Lavender Tang a good beginner tang?
It's a reasonable mid-difficulty option — hardier than the Powder Blue Tang but still needs strong water quality and swimming space like all Acanthurus species.
Can I keep a Lavender Tang with other tangs?
With care — avoid other similarly shaped Acanthurus species in a modest tank.
What tank size does a Lavender Tang need?
At least 400 litres given its adult size and swimming requirements.

Care guidance is drawn from our own experience — every fish is an individual, so treat it as a starting point, not a guarantee. Not sure if a species suits your tank? Come ask us in store. New to the terms? Read the care-terms glossary.