Sohal Tang (Acanthurus Sohal): A Stunning But Intense Showpiece Fish
The Sohal Tang (Acanthurus sohal) is one of the most striking surgeonfish available to reef keepers. With bold horizontal stripes, electric blue edging on the fins, and an assertive attitude, this Red Sea native quickly becomes the visual centerpiece of any large saltwater aquarium. However, its beauty comes with serious responsibility: the Sohal Tang is powerful, fast, and famously aggressive, so it’s best reserved for experienced hobbyists with big systems.
Tank Requirements & Long-Term Care
Sohal Tangs are highly active swimmers that can reach 14–16 inches in captivity. They need ample room to cruise and establish territory. For that reason, most hobbyists consider them a “last fish added” species in large displays.
- Minimum tank size: 180 gallons (6-foot tank) is the bare minimum; larger is strongly recommended.
- Aquascape: Open swimming lanes with strong flow and solid rockwork for grazing and retreat.
- Water parameters: 1.025 salinity, 78–80°F, pH 8.1–8.4, stable alkalinity and low nutrients.
- Flow: High, turbulent flow helps mimic their natural reef slopes and keeps them active.
If you’re still planning your system, it can help to read our broader stocking and husbandry guidance in Beginner Saltwater Fish for New Reef Tanks before committing to a demanding species like the Sohal.
Diet & Feeding Tips
In the wild, Acanthurus sohal spends most of its day grazing on filamentous algae. In captivity, a varied, algae-heavy diet is critical for health and coloration:
- Offer nori (dried seaweed) on a clip daily.
- Rotate quality herbivore pellets and flakes.
- Supplement with frozen foods like mysis and enriched brine for extra protein.
- Add vitamin and garlic supplements occasionally to support immunity and appetite.
Frequent, smaller feedings help reduce aggression by keeping the fish occupied and well-fed.
Temperament, Tankmates & Aggression Management
The Sohal Tang is notorious for its territorial behavior, especially toward other tangs and similarly shaped fish. As it matures, it often becomes the dominant fish in the tank and may relentlessly chase or injure more passive species.
Choosing Tankmates
- Avoid similar tangs: Especially other Acanthurus species or fish with similar body shapes and diets.
- Better companions: Robust wrasses, larger angelfish, and assertive but not overly aggressive reef-safe species.
- Inverts and corals: Generally reef-safe, though they may nip at algae around coral bases.
Tip: Add the Sohal Tang last, after more peaceful fish have established themselves. This reduces the chance it will view the entire tank as its personal territory from day one.
For more ideas on compatible species and building a stable community, see our guide on Peaceful Reef Fish for Community Tanks.
Acclimation & Health
Like many tangs, Sohals can be prone to marine ich and other external parasites, especially during shipping and acclimation. A dedicated quarantine tank is highly recommended:
- Use a drip acclimation method to reduce stress from rapid parameter changes.
- Observe for 2–4 weeks in quarantine, treating proactively if signs of parasites appear.
- Maintain high oxygenation and strong flow; stressed Sohals pace constantly and need excellent gas exchange.
If you’re new to quarantine procedures, our step-by-step article How to Set Up a Saltwater Quarantine Tank walks through equipment, medication options, and best practices.
Is the Sohal Tang Right for You?
The Sohal Tang (Acanthurus sohal) is a breathtaking, energetic show fish that can dominate a large reef display for many years. However, its size, aggression, and space requirements mean it’s not a casual addition. If you have a large, well-established system, understand quarantine, and are prepared to manage a dominant tang, the Sohal can be a rewarding centerpiece. For smaller tanks or more peaceful communities, consider one of the many gentler tangs or beginner-friendly species instead.
Sources
- Michael, S. W. Surgeonfishes, Rabbitfishes, and Their Relatives. Microcosm/TFH.
- Fenner, R. M. The Conscientious Marine Aquarist. TFH Publications.
- FishBase & public aquarium husbandry notes on Acanthurus sohal.
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