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Fish Saltwater Care: medium Aggressive

Sohal Tang

Acanthurus sohal
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Other names: Sohal surgeonfish, Arabian tang, Sohal
Group: Marine fish · Family: Acanthuridae · Origin: Western Indian Ocean — from the Red Sea to the Persian Gulf

The most aggressive tang of the Red Sea, with thin black horizontal lines on its whitish-gray body and an orange scalpel and breast patch. It reaches 40 cm; it needs a very large aquarium and gets along poorly with other tangs.

Will it suit my tank?

Last updated October 16, 2026

Temperature
24–27°C
pH
8.1–8.4
Adult size
40 cm
Minimum tank size
1000 liters
Social structure
Solitary
Swimming zone
Middle
Diet
Herbivore
Breeding
Egg scatterer

Water parameters

Temperature24–27°C
pH8.1–8.4
Recommended range
Considered reef safe At most 1 per tank

Overview

October 16, 2026 · Suggest an edit

The sohal tang is a large, eye-catching surgeonfish endemic to the Red Sea and the waters around the Arabian Peninsula. Its whitish-gray body is covered with thin black horizontal lines; the scalpel on the tail base and the area below the pectoral fin are bright orange, while the dorsal, anal and tail fins are black with blue edges. In the wild it fiercely defends its own grazing territory along wave-battered reef edges, and it keeps this habit in the aquarium too. Specimens are wild-collected; it is hardy, but because of its size and temperament it is suitable only for very large systems.

Tank Setup

October 16, 2026 · Suggest an edit
  • At least 1000 liters and a tank longer than 200 cm for an adult.
  • Salinity specific gravity 1.023–1.026, pH 8.1–8.4, temperature 24–27°C; strong flow and high oxygen.
  • Wide open swimming space; the rocks should be grouped in one part of the aquarium.
  • Reef-safe: It leaves corals and invertebrates alone.

Diet

October 16, 2026 · Suggest an edit

Herbivorous; in the wild it feeds on brown algae such as Sargassum and fine green algae. Offer dried seaweed and foods containing spirulina every day; frozen mysis serves as a supplement.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

One of the most aggressive tangs; using its sharp scalpel, it can injure other tangs and similarly shaped fish. For this reason it is usually added to the aquarium last.

Good companions: In a very large aquarium, large fish able to defend themselves: large angelfish, large wrasses, triggerfish, foxface.

Avoid: Other tangs, similarly shaped and skittish fish, small aquariums.

A short profile for this species

The Sohal Tang page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Should not be kept together

Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026