Magnificent Foxface Care Guide: Tank Size, Diet, Venom & Reef-Safe Caution

The Magnificent Foxface (Siganus magnificus) is a striking rabbitfish with a white face crossed by a broad black ocular band, a body that shifts from a clean white front into a brown-to-gray rear, and a fiery red-orange dorsal fin with yellow on the anal and caudal fins. Adults can reach about 9.5 inches, so they need real swimming room, constant plant matter, and respect for venomous dorsal and anal spines.

This guide covers tank size, herbivore diet, reef-safe-with-caution realities, venom handling, and a practical buying checklist. When you are ready to purchase, compare live listings in the ReefBay marketplace against the care targets below.

@lwalcott

Quick care snapshot

• Scientific name: Siganus magnificus
• Also called: Andaman Foxface, Magnificent Rabbitfish, Andaman Rabbitfish
• Category: Rabbitfish / foxface
• Origin: Eastern Indian Ocean (Andaman Sea to Java)
• Care level: moderate
• Temperament: peaceful toward other fish; shy when first added
• Reef-safe: with caution — may nip soft corals, LPS, or clam mantles if underfed
• Invert-safe: yes for most ornamental shrimp and snails
• Venomous: yes — dorsal and anal spines can deliver a painful sting
• Suggested tank: mature 125+ gallons with open swim lanes and rock grazing
• Max size: about 9.5 inches
• Social: solitary — typically one foxface per tank
• Diet: herbivore — algae, nori, and algae-based prepared foods
• Jump risk: low for this species, but a lid still helps during acclimation

Tank size, aquascape, and swim space

Plan for a mature system of about 125 gallons or larger. Magnificent Foxfaces are active daytime grazers that need linear rock to pick over and clear lanes to cruise. Crowding a nearly 10-inch rabbitfish into a short footprint creates stress hiding and more coral-nipping pressure.

• Leave open mid-water swimming paths along the front and top of the rock
• Provide caves and overhangs so a shy new fish can settle after lights-on
• Stable parameters matter — add them only after the tank is boringly settled
• In tanks under 125 gallons, waste load and territory stress climb quickly

If your goal is a delicate SPS-only display with prized softies and no herbivore grazing plan, reconsider. If you want a bold face-patterned algae eater in a large mixed reef and can keep plant matter available all day, this foxface is a standout.

@Babado

Diet and feeding schedule

Treat this fish as a true herbivore first. It should have algae and nori available daily, with algae-based pellets or flakes as backup. Hungry foxfaces are the ones that start sampling coral tissue.

1. Offer nori or seaweed clips daily so grazing is available between meals
2. Rotate algae-based prepared foods and occasional frozen herbivore blends
3. Keep plant matter high if you also stock other grazers that compete for nori
4. Ask sellers for recent feeding video — fish already eating nori settle in faster

Thin bellies and faded color usually mean food competition or too little plant matter, not “mystery disease” first. Captive-acclimated fish that already graze prepared foods on ReefBay listings are worth prioritizing.

Reef-safe with caution and venomous spines

“Reef-safe with caution” is a real warning for rabbitfish. Many Magnificent Foxfaces ignore corals when constantly grazed, then nip soft corals, LPS polyps, or clam mantles if they go hungry. Individual temperament varies.

• Higher coral risk: softies, fleshy LPS, zoanthids, and clam mantles in underfed tanks
• Lower coral risk: well-fed fish in large mixed reefs with constant nori — still not a guarantee
• Venom: dorsal and anal spines can sting. Net carefully, never bare-hand the fish, and warn anyone helping with tank maintenance
• Inverts: usually leave ornamental shrimp and snails alone when fed well

Compatibility and temperament

Peaceful toward other fish is the default, but foxfaces are often shy at first and do best as a single specimen. Aggressive tankmates that chase mid-water grazers will keep them hiding and missing meals.

• Often works: clownfish, peaceful wrasses, tangs in large systems, anthias or chromis with enough food to go around
• Risky: highly aggressive triggers, large predators, or another adult foxface/rabbitfish in a medium tank
• One per tank: default to a single Magnificent Foxface unless you have a very large reef and a clear plan
• Quarantine: still QT — new rabbitfish can carry parasites even when color looks perfect

Buying checklist on ReefBay

Before you tap Buy on a Magnificent Foxface listing, verify:

• Clear, recent photos or video showing body thickness, alert swimming, and an intact face pattern
• Seller notes on diet (nori / algae foods) and quarantine history
• Your tank is 125+ gallons with open swim lanes and a daily herbivore feeding plan
• You accept reef-safe-with-caution coral risk and will handle venomous spines safely

Browse current Magnificent Foxface listings in the ReefBay marketplace, then match the fish to the tank you actually run — not the tank you wish you had.

Common mistakes to avoid

• Stocking a nearly 10-inch rabbitfish in a short 75-gallon footprint
• Relying on leftover flakes instead of daily nori and algae foods
• Bare-handing or careless netting around venomous spines
• Buying a thin fish with no feeding proof

Done right, a Magnificent Foxface is one of the most distinctive large herbivores you can keep. Give it space, keep plant matter available, respect the spines, and use ReefBay listings to compare healthy, well-documented fish before you commit. Start on the Magnificent Foxface taxon page to compare seller photos next to care notes.