Foxface Rabbitfish

Siganus vulpinus

Animalia›Chordata›Actinopterygii›Siganidae

📍 Western Pacific Reefs

Bold yellow body with intricate brown-and-white facial patterning. Has venomous spines so handle carefully. Outstanding algae and nuisance weed grazer.

Size9"

Min Tank75g

peaceful

Zoneall

Care Guide

Diet

Foxface Rabbitfish are dedicated herbivores that graze constantly on algae and marine plants. Feed high-quality marine herbivore pellets or flakes daily, supplemented with dried seaweed sheets, nori, or spirulina-based foods 3-4 times weekly. They will naturally consume nuisance algae and macroalgae in the aquarium, reducing the need for supplemental feeding if adequate algae growth is present.

Behavior

This species is generally peaceful and non-aggressive toward other fish, though they can be territorial with their own kind and similar-looking rabbitfish. Foxface are active grazers that spend most of their time foraging along rocks and substrate, making them excellent for controlling unwanted algae blooms. They are bold and curious fish that quickly become accustomed to their aquarium environment and feeding routines.

Breeding

Breeding Foxface Rabbitfish in captivity is extremely rare and not reliably documented in home aquariums. They are broadcast spawners that require very large systems with specific water conditions and larval rearing capabilities that are impractical for most hobbyists. Captive-bred specimens are virtually unavailable; nearly all specimens in the hobby are wild-caught.

Tank Mates

Ocellaris Clownfish

Similar peaceful temperament and compatible water parameters; both reef-safe

excellent

Yellow Tang

Both herbivorous grazers; may compete for algae but generally coexist peacefully

good

Lawnmower Blenny

Complementary algae-eating behavior; similar peaceful nature and reef compatibility

good

Cleaner Shrimp

Non-competitive relationship; shrimp provide cleaning services without territorial conflict

excellent

Flame Angelfish

Can coexist but may show aggression if space is limited; monitor closely

caution

Common Diseases

Ich (Marine White Spot Disease)

Symptoms

White spots on body and fins, rapid breathing, rubbing against rocks, lethargy

Treatment

Raise temperature to 28-29°C, use copper-free marine ich treatments, maintain excellent water quality and aeration

Fin Rot

Symptoms

Frayed or deteriorating fin edges, discoloration at fin margins, progressive fin loss

Treatment

Improve water quality, perform frequent partial water changes, use antibiotic treatments if bacterial infection is confirmed

Velvet Disease (Oodinium)

Symptoms

Fine golden or rust-colored dust on body, rapid breathing, loss of appetite, scratching behavior

Treatment

Quarantine immediately, raise temperature to 28-29°C, use copper-free marine velvet treatments, ensure excellent oxygenation

Poisoning from Venomous Spines

Symptoms

Localized swelling, pain, or tissue damage if handler is pricked; in fish, signs of distress after spine contact

Treatment

Handle only with nets or containers; if stung, soak affected area in hot water (as hot as tolerable) for 20-45 minutes and seek medical attention if severe