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Blue-spotted Rabbitfish (Siganus corallinus)

Blue-spotted Rabbitfish

Siganus corallinus
Family
Rabbitfish
Care level
Beginner
Temperament
Peaceful
Reef safe
Reef safe with caution
Max size
40 cm
Min tank
450 L · 119 gal
Origin
Indo-Pacific
Diet
Omnivore
Food
Nori, Marine algae, Herbivore pellets, Spirulina, Vegetable frozen blends

Overview

The Blue-spotted Rabbitfish is a bright yellow fish covered in fine blue spotting, a peaceful and effective algae grazer that also brings genuine colour to a large reef display. Like all rabbitfish it carries venomous spines in its dorsal, anal, and pelvic fins, used purely for defence rather than aggression.

It's an excellent alternative to tangs for algae control in tanks where tang territoriality is a concern, since rabbitfish are generally far more peaceful and less prone to fighting with other herbivorous grazers.

Given its adult size and grazing needs, it does best in a large, well-established tank with plenty of live rock supporting natural algae growth alongside regular supplemental feeding.

Compatibility

Blue-spotted Rabbitfish are peaceful and generally get along well with tangs, angelfish, and other community fish, rarely showing the territorial aggression common among surgeonfish. They are fully reef safe and won't bother corals, clams, or invertebrates.

Care should be taken when netting or handling this fish, as its venomous spines can deliver a painful sting if mishandled, though it poses no threat to tankmates under normal circumstances.

Health & quarantine

This species is generally hardy once acclimated, though care is needed during any netting or transfer due to its venomous spines, which can also become entangled in nets. A minimum four-week quarantine is recommended, and a calm, well-fed tank supports its transition onto a varied prepared diet.

Frequently asked questions

Are rabbitfish spines dangerous?
They're venomous and can deliver a painful sting if the fish is mishandled or netted carelessly, but they pose no threat to tankmates under normal conditions.
Is the Blue-spotted Rabbitfish reef safe?
Yes, fully reef safe with corals and invertebrates.
Is the Blue-spotted Rabbitfish a good alternative to a tang?
Yes, it offers similar algae-grazing benefits with a generally more peaceful temperament than most tangs.
What tank size does a Blue-spotted Rabbitfish need?
At least 500 litres given its adult size and grazing requirements.
Can I keep a Blue-spotted Rabbitfish with tangs?
Yes, it generally coexists peacefully with tangs and rarely competes aggressively for territory.

Care guidance is drawn from our own experience — every fish is an individual, so treat it as a starting point, not a guarantee. Not sure if a species suits your tank? Come ask us in store. New to the terms? Read the care-terms glossary.