Acanthurus olivaceus
Shoulder Tang
Shoulder Tang
SKU:F-TNG-013
Out of stock
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Medium
Semi-Aggressive
Reef Safe
Orangeshoulder Tang
Orangeshoulder Tang – Acanthurus olivaceus
The Orangeshoulder Tang, scientifically known as Acanthurus olivaceus, is also commonly referred to as the Orange-epaulette Surgeonfish, Orangespot Surgeonfish, or Orangeband Surgeonfish. It is one of the most attractive tang species, displaying a remarkable transformation in coloration as it matures.
As a juvenile, the fish has an almost entirely bright yellow body with subtle blue edging along the dorsal and anal fins. As it grows, the front half of the body changes to a pale gray, while the rear half develops a bluish-gray coloration. A vivid orange patch surrounded by a dark gray border appears above the pectoral fin, giving the species its common name. Its distinctive lyre-shaped tail further enhances its elegant appearance.
The Orangeshoulder Tang is an excellent choice for large reef aquariums. Compared with many other tang species, it generally has a calmer temperament while still bringing constant movement, striking coloration, and natural algae-grazing behavior to the aquarium.
Key Features
- Undergoes a beautiful and dramatic color transformation as it matures.
- Features a distinctive orange shoulder patch that gives it a unique appearance.
- Helps control natural algae growth within the aquarium.
- An active swimmer that adds movement and energy to the tank.
- Reef-safe and suitable for aquariums containing corals and invertebrates.
Aquarium Requirements
- Minimum Aquarium Size: Approximately 680 liters (180 gallons).
- Requires a large aquarium with plenty of open swimming space.
- Live rock should be provided with suitable areas for grazing and hiding.
- Requires stable water quality and good water movement.
- A well-established aquarium with natural algae growth is highly recommended.
Compatibility & Temperament
| Aggression Level | Semi-peaceful |
| Reef Compatibility | Yes, generally safe with corals and invertebrates |
| Fish Compatibility | Compatible with most marine fish when provided with adequate swimming space |
| Tang Compatibility | Generally less aggressive toward other tangs than many similar species |
The Orangeshoulder Tang is generally calmer toward other surgeonfish than many closely related tang species. When keeping more than one specimen, introducing a smaller juvenile into an aquarium that already contains a mature individual may help reduce territorial behavior and improve compatibility.
Feeding
Although the Orangeshoulder Tang will accept meaty foods, its diet should consist primarily of marine algae and other plant-based foods to support healthy digestion, immune function, coloration, and long-term well-being.
Recommended foods include:
- Dried seaweed (Nori).
- Marine algae formulated specifically for tangs.
- High-quality vegetable-based pellets and flakes.
- Frozen Mysis Shrimp.
- Krill and other frozen marine foods.
Reefamorous Tip: Offer dried marine seaweed at least three times per week using a dedicated algae clip or by securing it to the live rock. Regular access to plant-based foods supports the immune system, helps reduce aggressive behavior, and maintains the fish’s health, activity, and natural coloration.
