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About Black Spot Foxface

The Black Spot Foxface, also known as the One Spot Foxface or Blackblotch Foxface, is a striking rabbitfish recognised by its bright yellow body, black facial markings, white lower face and distinctive black spot on the upper rear body. The black spot is the key feature separating it from the closely related Foxface Rabbitfish, Siganus vulpinus.

Black Spot Foxfaces are excellent algae-grazing fish and spend much of their day browsing across rockwork for algae. They are generally peaceful community fish and can make excellent additions to established reef aquariums.

They are primarily herbivorous and should receive plenty of nori, marine algae, Spirulina and quality herbivore foods. A well-fed specimen is less likely to show interest in corals.

Like all rabbitfish, they have venomous spines in their fins, so care should be taken when handling, catching or moving them.

Quick Care Guide

Scientific Name: Siganus unimaculatus
Common Name: Black Spot Foxface / One Spot Foxface / Blackblotch Foxface
Family: Siganidae
Type: Marine Fish / Rabbitfish
Adult Size: Approximately 20–25 cm
Temperament: Peaceful
Care Level: Easy to Intermediate
Minimum Aquarium: 300 L+
Temperature: 24–28°C
pH: 8.0–8.4
Salinity: 1.023–1.026 SG
Diet: Herbivore
Tank Level: All Levels
Reef Safe: With Caution
Suitable For: Mature marine and reef aquariums

Frequently Asked Questions

Are Black Spot Foxfaces reef safe?

They are generally reef compatible with caution. They are excellent algae grazers, but hungry individuals can occasionally nip at some corals. Maintaining a consistent herbivorous diet helps reduce this risk.

What do Black Spot Foxfaces eat?

They primarily eat algae and seaweed. Provide nori, marine algae, Spirulina-based foods and quality herbivore pellets.

How big does a Black Spot Foxface get?

They can reach approximately 20–25 cm, so a large aquarium with plenty of swimming room is recommended.

Are Black Spot Foxfaces aggressive?

They are generally peaceful towards most community fish. However, they may become territorial towards other rabbitfish or Foxface species.

What is the black spot for?

The large black spot on the upper rear body is the distinctive feature of Siganus unimaculatus. The closely related Siganus vulpinus does not have this permanent spot.

Common Mistakes

Not feeding enough algae
These are dedicated herbivores and should receive regular marine algae and vegetable foods.

Assuming they will never nip corals
A hungry Foxface may occasionally investigate corals, particularly if its dietary needs aren't being met.

Keeping multiple rabbitfish in a small aquarium
Territorial behaviour can develop between rabbitfish.

Handling them without care
Their dorsal, pelvic and anal spines contain venom and can deliver a very painful sting.

Adding one to an immature aquarium
A mature aquarium with established algae growth provides valuable natural grazing opportunities.

Not providing enough swimming space
Despite their peaceful nature, they become substantial active fish and need room to explore and graze.