Achilles Tang

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The Achilles Tang (Acanthurus achilles) is one of the most sought-after showpiece fish in the saltwater hobby, known for its deep black body and striking orange tail marking. This is an expert-level tang that thrives in large, high-flow systems and delivers unmatched movement and presence in a mature reef tank.

Quick Care Facts

• Care Level: Expert
• Temperament: Semi-aggressive
• Diet: Herbivore
• Reef Safe: Yes
• Minimum Tank Size: 180+ gallons
• Max Size: ~9 inches
• Origin: Hawaii / Pacific

Behavior & Compatibility

The Achilles Tang is an extremely active swimmer that requires open space and strong water movement. It can be aggressive toward other tangs, especially in smaller or crowded tanks, so it is best kept as the only surgeonfish unless the system is very large.

It does well with confident, non-aggressive tankmates and performs best in stable environments without constant stress or competition.

Diet & Feeding

This species is a dedicated herbivore that feeds on algae throughout the day. In captivity, it should be fed nori, spirulina-based foods, and marine algae regularly.

Feed multiple times daily when possible. Newly introduced Achilles Tangs can be slow to eat, so consistent feeding and low stress are critical early on.

Tank Setup

A minimum of 180 gallons is required, but tank design matters just as much as size. Provide:

• Long, open swimming space
• Strong, consistent water flow
• High oxygen levels
• Stable, mature water conditions

Reef Safety

The Achilles Tang is considered reef safe and will not damage corals. It may graze on algae within the tank, which can actually benefit reef systems when properly fed.

Acclimation & First 48 Hours

This is a sensitive species, especially during introduction.

• Keep lighting low initially
• Provide immediate access to algae (nori)
• Avoid aggressive tankmates early
• Maintain stable parameters

Achilles Tangs are known to be prone to stress-related issues like ich if introduced improperly, so a calm, controlled acclimation process is key.