| Scientific Name | Siganus niger |
| Common Names | Black Foxface, Tongan Black Foxface, Black Rabbitfish |
| Max Length | 9 inches (22 cm) |
| Min Tank Size | 125 gallons (473 liters) |
| Temperament | Peaceful; gets along with most non-aggressive tankmates but may be territorial with other rabbitfish or similar species. Handle with care due to venomous dorsal spines, which can cause painful stings. |
| Reef Safe | ⚠ With Caution |
The Black Foxface is a rare and striking addition for hobbyists seeking an exotic centerpiece for their aquariums. Its sleek, almost entirely black body, accented by bright yellow pectoral fins and a vermiculated white opercular stripe, creates a bold, elegant look that stands out against vibrant reef backdrops. Endemic to Tonga’s northern Vava’u islands, this elusive fish captivates aquarists with its graceful grazing, as it methodically crops algae from live rock, adding both beauty and function to the tank. A spacious 125-gallon tank with plenty of rockwork and swimming space suits its active nature, while a robust algae-based diet keeps it content and healthy. Its peaceful demeanor and algae-eating prowess make it a prized choice for dedicated keepers, though caution is needed with its venomous spines during handling.
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Herbivorous; primarily feeds on algae in the wild, with occasional small invertebrates. In aquariums, offer algae-based flakes, nori seaweed, spirulina-enriched pellets, or frozen herbivore blends. Feed 2-3 times daily in small amounts. Algae-covered live rock is essential for grazing to maintain health and prevent coral nipping.
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