Is the One Spot Foxface reef safe?

They are generally considered 'reef safe with caution'. While they primarily eat algae, some individuals may nip at fleshy LPS corals or soft corals like zoanthids, particularly if they are not provided with enough herbivorous food.

How venomous is a Foxface?

Their venom is not deadly to humans unless an allergic reaction occurs, but a sting is excruciatingly painful, often described as much worse than a bee sting. Care should be taken when placing hands in the tank.

Why has my Foxface turned a splotchy brown colour?

This is a natural camouflage response. They change to a mottled brown and white pattern at night to sleep, or during the day if they are frightened, stressed, or newly introduced to an aquarium. They will return to yellow once settled.

Can I keep two Foxface rabbitfish together?

It is not recommended. Rabbitfish are notoriously aggressive towards their own kind and closely related species. Unless you have a massive system (over 800 litres) and introduce a known bonded pair, they will fight.

Will a One Spot Foxface eat bubble algae?

Yes, many One Spot Foxfaces are excellent consumers of Valonia (bubble algae) and are frequently introduced to marine aquaria specifically to control outbreaks of this nuisance algae.

MarineMarineIntermediate

One Spot Foxface

Siganus unimaculatus

A vibrant, algae-grazing marine fish known for its bright yellow body, distinctive black lateral spot, and venomous dorsal spines.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.026 SG
Adult size: 18 – 20 cm
Standard 4ft marine tank: 280 litres+
Lifespan: 10 – 15 years
Diet: Herbivore

About the One Spot Foxface

The One Spot Foxface, distinguished effortlessly from the standard Foxface Rabbitfish by the prominent black spot on its upper posterior flank, is a highly popular addition to marine aquariums. Renowned for its voracious appetite for nuisance algae, it serves as a functional and highly attractive display specimen. Taxonomists sometimes debate whether it is a true distinct species or a regional variant of *Siganus vulpinus*, but in the aquarium trade, it is firmly established in its own right. While inherently peaceful, it demands respect due to the venomous spines lining its dorsal and anal fins.

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Is it right for your tank?

Check One Spot Foxface against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where One Spot Foxface comes from

Native range

Western Pacific, Ryukyu Islands, Philippines

Countries / regions

Australia, Philippines, Japan

Habitat

Shallow coral reefs, coastal lagoons, and sheltered bays with abundant macroalgae growth.

Primarily distributed in the Western Pacific ocean.

Similar species

Foxface Rabbitfish
Siganus vulpinus
Magnificent Rabbitfish
Siganus magnificus
Two Barred Rabbitfish
Siganus doliatus

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful community fish that occupy different swimming zones and will not compete with or harass the Foxface.
Great
Coral Beauty Angelfish
Centropyge bispinosa
Dwarf angelfish generally ignore rabbitfish, making them excellent, colourful companions in a sufficiently large system.
Great
Yellow Tang
Zebrasoma flavescens
Although both are yellow herbivores, they belong to different families and usually coexist peacefully in large tanks.
Great
Open Brain Coral
Trachyphyllia geoffroyi
The Foxface is generally reef safe but may occasionally nip at fleshy large polyp stony (LPS) corals, particularly if underfed.
Compatible with caution
Zoanthids
Zoanthus spp.
Some individuals develop a taste for soft corals like zoanthids, necessitating close observation in a mixed reef.
Compatible with caution
Foxface Rabbitfish
Siganus vulpinus
Conspecifics and closely related rabbitfish species are highly territorial towards one another and will fight relentlessly.
Not recommended
Panther Grouper
Chromileptes altivelis
Large predatory fish may attempt to swallow the Foxface, resulting in the predator being envenomated and potentially killing both fish.
Not recommended

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