Magnificent Foxface — Siganus magnificus
(Venomous spines)

Algae-eating rabbitfish. Peaceful, robust.

Quick facts

• Size: 20–24 cm

• Temperament: Peaceful, may display to similar fish

• Reef-safe: With caution (may nip softies/LPS if underfed)

• Minimum tank: 400+ l / 100+ gal

• Special: Dorsal spines are venomous

Aquarium

• Space: Long tank with open lanes and rockwork for grazing and cover.

• Water: pH 8.1–8.4, salinity 1.025–1.026, temp 24–26 °C; NH3/NO2 0, NO3 <20 ppm, PO4 <0.1 ppm.

• Flow: Moderate.

• Lighting: Standard reef; stress “pajama” camouflage is normal.

• Cover: Recommended. Startles easily.

Diet

• Primary: Macroalgae and film algae, including hair algae.

• Daily feed: Nori/seaweed sheets, spirulina pellets, herbivore flakes; add occasional mysis/roe for variety.

• Goal: Keep well fed to minimize coral nipping.

Behavior and compatibility

• Community: Good with most peaceful to semi-assertive species.

• Conspecifics: One per tank unless a proven pair in a very large system.

• Corals/inverts: Usually safe; monitor with fleshy LPS, zoas, and clams.

Acclimation and care

• Acclimate: 30–45 min drip; dim lights.

• Handling: Use a container, not a net. Spines snag and can envenomate.

• Health: Hardy; provide varied greens to prevent nutritional issues.

Venom note

• If stung, immerse the area in tolerably hot water for 30–90 minutes and seek medical advice.

Selection checklist

• Clear eyes, steady breathing, active grazing.

• Eats nori and pellets at the store.

• No fin erosion or pinched belly.