Decorated Rabbitfish (Siganus Puellus)

Decorated Rabbitfish (Siganus puellus)

The Decorated Rabbitfish, also known as the Masked Rabbitfish or Orange-Spotted Rabbitfish, is one of the most elegant and functional members of the Siganidae family. While many rabbitfish are prized solely for their utility as algae eaters, the Decorated Rabbitfish is equally valued for its intricate, high-contrast pattern. It is a fantastic alternative to Tangs for those looking for a peaceful, hard-working herbivore.

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Key Information

• Common Names: Decorated Rabbitfish, Masked Rabbitfish, Blue-Lined Rabbitfish

• Scientific Name: Siganus puellus

• Origin: Indo-Pacific (Indonesia to the Great Barrier Reef)

• Max Size: 25–28 cm (approx. 10–11 inches)

• Lifespan: 5–10 years

• Temperament: Peaceful; shy when first introduced

• Diet: Herbivore – Expert consumer of nuisance algae

• Care Level: Easy to Moderate

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Appearance & Identification

The Decorated Rabbitfish is easily identified by its sophisticated "pinstripe" aesthetic:

• The Body: A bright yellow-to-gold base covered in a network of fine, wavy electric-blue lines.

• The "Mask": Features a prominent dark brown-to-black diagonal bar that runs through the eye, giving it a masked appearance.

• The Spots: The dark mask often features small black dots or "freckles" that add to its unique look.

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The "Venomous" Warning

Like all rabbitfish, the Decorated Rabbitfish has venomous dorsal and anal fin spines.

• Defense Only: They are not aggressive and will never "attack" you with these spines.

• Handling: Use extreme caution when netting the fish or working near it in the rockwork. A sting is similar to a severe bee sting and can cause significant pain and swelling. Never handle this fish with your bare hands.

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Behaviour & Tank Compatibility

• The Ultimate Algae Eater: This fish is a powerhouse. It is one of the few species known to consume Bubble Algae (Valonia), as well as hair algae and film algae.

• Peaceful Demeanor: They are exceptionally docile and rarely bother other tank mates. In fact, they are often bullied by aggressive Tangs, so they should be provided with plenty of hiding spots.

• Reef Safe (with Caution): Generally considered reef-safe, but they are known to occasionally nip at LPS corals and Zoanthids, especially if they are not well-fed. They are usually 100% safe with SPS corals.

• Tank Mates: Excellent with Tangs, Wrasses, and Anthias. They can be kept in mated pairs if introduced simultaneously, but they may squabble with other rabbitfish species in smaller tanks.

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Ideal Tank Setup

• Tank Size: A minimum of 380L–475L (100–125 Gallons) is required. They are active swimmers and grow to a substantial size.

• Rockwork: Provide plenty of large caves. Rabbitfish are "nervous" fish and need a place to bolt to if they feel threatened.

• Camouflage: Do not be alarmed if your rabbitfish turns a blotchy, mottled brown/gray at night or when stressed. This is their natural camouflage and is not a sign of disease.

• Dietary Needs: Their primary diet must be vegetable-based. Provide dried seaweed (Nori) daily and supplement with spirulina-enriched flakes or pellets.

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Why Choose the Decorated Rabbitfish?

The Decorated Rabbitfish is the "gentle giant" of the reef. It offers the same (if not better) algae-cleaning services as the most popular Tangs but with a much more peaceful personality. Its intricate blue-on-yellow patterning makes it a stunning visual addition, and its ability to tackle tough algae like Bubble Algae makes it a functional hero in any large reef system.