Saltwater Fish

Foxface Rabbitfish

Siganus vulpinus

Care guide, husbandry, breeding, disease, and sourcing intelligence on Foxface Rabbitfish - written by the Fast Aquatics editorial team.

Foxface Rabbitfish at a glance
Adult size: 9 inches · Min tank/pond: 125 gallons · Difficulty: intermediate · Diet: herbivore · Lifespan: 5-10 years.

Foxface Rabbitfish (Siganus vulpinus) is a popular saltwater fish in the aquarium and pond hobby. Suitable for keepers with 6-12 months of stable-tank experience.

Where Foxface Rabbitfish comes from

Foxface Rabbitfish (Siganus vulpinus) is native to Indo-Pacific reef ecosystems. Wild populations distribute across coral reefs from East Africa through Indonesia, the Philippines, and into the western Pacific. Captive-bred Foxface Rabbitfish is increasingly available and is the more sustainable choice when you can find it.

Foxface Rabbitfish tank size and setup

Foxface Rabbitfish requires a minimum of 125 gallons for healthy adults. The minimum is based on 9 inches adult size and territorial range. For Foxface Rabbitfish, plan a mature reef tank with stable parameters, sand bed, live rock for cover, and reef LED if photosynthetic.

Water parameters for Foxface Rabbitfish

Foxface Rabbitfish requires standard reef parameters: temperature 76-80°F, specific gravity 1.025, pH 8.1-8.4, alkalinity 8-9 dKH, calcium 420-450 ppm, magnesium 1300-1400 ppm, ammonia + nitrite 0 ppm, nitrate under 10 ppm. Use a refractometer (not hydrometer) to measure salinity.

What Foxface Rabbitfish eats

Foxface Rabbitfish is a herbivore. Provide algae sheets, algae-based pellets, and supplemental veggies. Skip a feeding day per week for tank biology. Browse our food guides for product recommendations.

Foxface Rabbitfish tankmates and compatibility

Foxface Rabbitfish is best paired with peaceful reef-tank species in similar size class. Avoid known fin-nippers and large aggressive species.

Foxface Rabbitfish adult size and lifespan

Foxface Rabbitfish reaches 9 inches at adulthood with a captive lifespan of 5-10 years with proper care.

Can you breed Foxface Rabbitfish?

Foxface Rabbitfish breeding in captivity ranges from straightforward to very difficult. Captive-bred specimens are increasingly available from sustainable aquaculture facilities.

Common Foxface Rabbitfish diseases and problems

Foxface Rabbitfish is susceptible to ich, velvet, marine flukes, and bacterial infections. Quarantine new Foxface Rabbitfish for 4-6 weeks before adding to display.

Where to buy Foxface Rabbitfish online

Foxface Rabbitfish is sold at LFS, online retailers, and direct from breeders. Browse live Foxface Rabbitfish from vetted Fast Aquatics vendors with carrier-tracked overnight shipping, climate-aware hold logic, and a 4-hour DOA window with photo-evidence claims.

Other species in the same category with care profiles on Fast Aquatics. Click any name for the full husbandry breakdown.

Snowflake Moray EelPorcelain CrabNeopetrolisthes maculatusOctospawn CoralTarget Mandarin DragonetPacific Cleaner ShrimpLysmata amboinensisPolka Dot Hermit CrabPhimochirus operculatus

Sources and references

Foxface Rabbitfish taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.

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Browse the full disease database, calculator collection, aquarium glossary, or Q&A library for additional reference.

Deep-dive Q&A on Foxface Rabbitfish

Answers to the questions experienced keepers ask after the basic care guide.

How long does Foxface Rabbitfish take to acclimate to a new tank?

Drip acclimation over 60 to 90 minutes is the safest approach for Foxface Rabbitfish. Match temperature first (15 minute float), then drip 2 to 3 drops per second from the display sump until the bag volume has tripled. Test salinity (or freshwater hardness) at the end - if it is within 0.001 SG (or 2 dGH) of the display, transfer the specimen with a net rather than pouring shipping water in.

What is the best filtration setup for Foxface Rabbitfish?

Aim for biological + mechanical + chemical staging. Canister or sump-driven filtration sized for 5x to 8x display turnover per hour, mechanical floss replaced weekly, and carbon or GAC swapped every 4 to 6 weeks. Foxface Rabbitfish responds well to stable nitrate (under 20 ppm) more than to any specific filter brand - stability beats peak performance.

Does Foxface Rabbitfish need a protein skimmer?

For saltwater specimens, yes - a properly-sized skimmer rated for 1.5x to 2x display volume keeps dissolved organics low and reduces nuisance-algae triggers. Freshwater specimens do not need skimmers; a well-stocked plant grow-out + canister with chemical media achieves the same end. Foxface Rabbitfish kept without adequate organic export tends to show stress within 90 days.

Can Foxface Rabbitfish be kept in a planted tank?

Compatibility with planted tanks depends on the species behavior + water chemistry overlap. Plant-safe specimens leave foliage alone; some pick at soft-tissue plants like vallisneria or anubias. Check the species page profile + the planted-tank compatibility note before stocking Foxface Rabbitfish in a high-tech CO2-injected setup with valuable cultivars.

What is the ideal lighting for Foxface Rabbitfish?

For freshwater specimens with no plant requirements, a basic LED at 30 to 50 PAR at substrate is sufficient and reduces algae. For saltwater + reef specimens, target 100 to 250 PAR depending on photo-tolerance, with a sunrise/sunset ramp + a 8 to 10 hour photoperiod. Foxface Rabbitfish tolerates a wider lighting band than most keepers expect; consistency matters more than peak intensity.

Does Foxface Rabbitfish prefer high or low water flow?

Most aquarium species evolved in moderate flow with localized turbulence rather than uniform high flow. Aim for 20x to 40x display turnover for reef specimens, 4x to 6x for community freshwater. Foxface Rabbitfish shows stress fins (clamped, frayed) when flow is mismatched - dial back if you see this within 14 days of introduction.

What temperature shift will stress Foxface Rabbitfish?

Sustained drift above +/- 2 F from target is the threshold most keepers miss. Foxface Rabbitfish tolerates day-night swings of 1 to 2 F without issue but a 4 F shift over 2 hours triggers ich + bacterial bloom risk. Use a controller-driven heater (not the built-in dial) and a backup thermometer at the opposite end of the tank.

What are the top 3 diseases that hit Foxface Rabbitfish the most?

For freshwater fish: ich, columnaris, and fin rot are the top three; quarantine + UV sterilizer prevents the majority. For marine fish: ich (Cryptocaryon), velvet (Amyloodinium), and bacterial infections; tank-transfer method or copper QT during the 30-day acclimation cycle prevents nearly all outbreaks. For inverts + corals: tissue necrosis, parasitic isopods, and protozoan blooms.

Can Foxface Rabbitfish be bred in captivity?

Captive breeding success varies enormously by species - some breed readily in community tanks (livebearers, cherry shrimp, clownfish) while others have never been captive-bred (most reef fish + most marine inverts). Check the species-specific care guide for the breeding-method note + larval-rearing protocol. Foxface Rabbitfish kept in pairs or small groups often spawns even without intent if conditions are right.

What are the best tankmates to avoid for Foxface Rabbitfish?

Avoid same-species rivals (especially male-male pairings for territorial species), known fin-nippers (tiger barbs, certain pufferfish), and anything that out-competes for food or out-grows the tank. Foxface Rabbitfish also struggles with hyper-aggressive cichlids in freshwater and damselfish in saltwater - both will hold territory at the expense of every other tankmate.

Is Foxface Rabbitfish safe to keep with cleaner shrimp or cleaner wrasses?

Most ornamental specimens accept cleaner shrimp + cleaner gobies; cleaner wrasses (Labroides) often die in captivity and are not recommended. Foxface Rabbitfish kept with cleaner pairs typically benefits from parasite control + stress reduction, but verify the cleaner does not get eaten by checking the species size + temperament chart.

What is the realistic lifespan of Foxface Rabbitfish with proper care?

Captive lifespan tracks closely to wild lifespan when water chemistry, diet, and tankmate stress are managed. Most aquarium fish live 5 to 12 years; long-lived species (large cichlids, pufferfish, some tangs) reach 15+ years. Foxface Rabbitfish kept in a stable, properly-sized system should live within 80% to 100% of the species lifespan ceiling - early death usually traces back to chronic-stress causes (parameters, tankmates, diet) rather than disease.