Convict Tang Acanthurus triostegus

Convict Tang

The Convict Tang stands out immediately with its clean white-to-silver body and bold vertical black bars. This pattern gives the species its well-known striped look and makes it easy to identify in any saltwater setup. In the fish catalog, this species continues to draw attention for its constant movement and distinct coloration. It is also commonly referred to as the Convict Surgeonfish.

Convict Tang Behavior and Tank Setup

Among Tangs (Surgeonfish), the Convict Tang has a more peaceful temperament than most other species in the group. It thrives in aquariums that provide open swimming space and steady water flow. This species does best when kept either alone or in a group of its own kind introduced at the same time, as other tang species may cause stress or territorial behavior.

Convict Tang Feeding and Daily Activity

The Convict Tang spends much of its day grazing on algae and surfaces throughout the tank. While it will accept a variety of prepared foods, a diet rich in marine-based algae helps maintain long-term health. Regular feeding with dried seaweed or plant-based options supports immune function and reduces the chance of aggressive behavior.

Convict Tang Breeding Notes

Breeding the Convict Tang in a home aquarium remains uncommon. The early life stages require a prolonged planktonic phase, which creates challenges in controlled environments. Because of this, most specimens available in the trade are sourced rather than bred in captivity.

Learn More About the Convict Tang

For additional scientific and habitat information on the Convict Tang, refer to its profile on FishBase:

Species Facts

• Difficulty Level: Moderate

• Temperament: Semi-aggressive

• Color Pattern: White and Brown Stripes

• Diet Type: Herbivore

• Reef Compatibility: Yes

• Ideal Water Conditions: 8 to 12 dKH, 72 to 78 degrees farenheit, 8.1 to 8.4 pH, 1.020 to 1.025 water density

• Adult Max Size: 8 inches

• Native Region: Indo-Pacific

• Scientific Family: Acanthuridae
• Scientific Name: Acanthurus triostegus

• Minimum Recommended Tank Size: 130 gallons

• Maximum Tank Size: 200 gallons or more

 Purchase Size

• Tiny: 3/4" to 1-1/2"
• Small: 1-1/2" to 2"
• Small/Medium: 2" to 2-3/4"
• Medium: 2-3/4" to 3-1/4"
• Medium/Large: 3-1/4" to 4-1/4"
• Large: 4-1/4" to 6-1/4"