Foxface; Yellow – Siganus vulpinus

About this fish

Foxface; Yellow – Siganus vulpinus is a yellow rabbitfish/foxface (family Siganidae) for saltwater aquariums. It’s a grazing, herbivorous fish commonly added to help manage nuisance algae and to add an active, reef-aquarium look. In practical setups, plan for steady long-term feeding with quality herbivore foods and a tank built around open swimming space plus rockwork for grazing and cover.

Features:

• Herbivore algae grazer that typically benefits from regular feeding of seaweed-based foods and high-quality herbivore preparations
• Active, “foraging” behavior: spends time grazing on algae/foods and moving through the rockwork
• Peaceful temperament overall, though individual fish can show territorial behavior—especially as they mature
• Reef-aquarium friendly by diet (herbivore-focused), but you should avoid assuming it will ignore all tank life; provide plenty of appropriate plant matter
• Venomous dorsal/anal spines mean careful netting and handling are important for aquarists
• Best suited to established marine tanks with stable parameters and consistent feeding routines

Specifications:

• Scientific name: Siganus vulpinus
• Care level (general guidance): Moderate
• Temperament: Peaceful (can become territorial as an adult)
• Diet: Herbivore; herbivore preparations, dried seaweed/nori (with frequent feeding as a grazing fish)
• Adult size: Up to about 9 in (approximately 23 cm)
• Minimum tank size (guidance): About 75 gallons (about 400 liters)
• Temperature: 72–78°F (about 22–26°C)
• pH: About 8.1–8.3
• Salinity: About 1.02–1.025 (specific gravity)