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About Freckled Tang

The Freckled Tang is a distinctive surgeonfish recognised for its blue-grey to olive body covered with fine dark spots, along with blue markings around the face and a darker area near the tail. Its unusual pattern makes it a less common but highly attractive tang for experienced marine aquarists.

Freckled Tangs are active swimmers and natural grazers, spending much of their day exploring rockwork and feeding on algae and biofilm. A mature aquarium with established live rock and plenty of open swimming space is ideal.

Like many Acanthurus tangs, they can become territorial towards other surgeonfish, particularly fish with a similar body shape. They are best kept as a single tang unless housed in a very large system with carefully selected tank mates.

Their diet should contain plenty of marine algae, including nori, Spirulina, algae-based pellets and other herbivore foods. Regular feeding is important for maintaining body condition.

Freckled Tangs are generally reef safe and will normally leave corals alone.

Quick Care Guide

Scientific Name: Acanthurus maculatus
Common Name: Freckled Tang / Spotted Surgeonfish
Family: Acanthuridae
Type: Marine Fish / Surgeonfish / Tang
Adult Size: Approximately 25–30 cm
Temperament: Semi-Aggressive / Territorial
Care Level: Advanced
Minimum Aquarium: 500 L+
Temperature: 24–28°C
pH: 8.0–8.4
Salinity: 1.023–1.026 SG
Diet: Herbivore
Tank Level: All Levels
Reef Safe: Yes
Suitable For: Large mature reef aquariums and experienced marine aquarists

Frequently Asked Questions

How big does a Freckled Tang get?

Freckled Tangs can reach approximately 25–30 cm, so they require a large aquarium with plenty of swimming space.

Are Freckled Tangs reef safe?

Yes. They are generally considered reef safe and are excellent algae grazers for mature reef aquariums.

What do Freckled Tangs eat?

They primarily graze on algae and biofilm. Offer regular nori, marine algae, Spirulina-based foods and quality herbivore pellets.

Can Freckled Tangs be kept with other tangs?

They can become territorial towards other surgeonfish, particularly similarly shaped Acanthurus species. A large aquarium and careful selection of tank mates are important.

Do Freckled Tangs need live rock?

Yes. Mature live rock provides natural algae and biofilm for grazing, as well as shelter and exploration areas.

Common Mistakes

Keeping one in an undersized aquarium
These are active fish that become relatively large and require substantial swimming space.

Not providing enough algae-based food
Regular marine algae and nori should supplement their natural grazing.

Keeping incompatible tangs together
Territorial aggression can become significant between surgeonfish.

Adding one to an immature aquarium
Established live rock provides valuable natural grazing opportunities.

Ignoring the caudal spine
Like other surgeonfish, Freckled Tangs have a sharp spine near the tail that can cause injury when handling or catching the fish.