Why is my Tuxedo Urchin carrying shells and rocks?

This is a natural behaviour known as 'covering'. They use their tube feet to lift small pieces of rubble, shells, or macroalgae onto their bodies to camouflage themselves from predators and block intense ultraviolet light.

Will a Tuxedo Urchin eat my corals?

No, they are generally considered completely reef safe and are strictly herbivores. However, they may occasionally graze on the algae growing right at the base of a coral, and their clumsy movement can knock over unattached coral frags.

Why is my urchin dropping its spines?

Spine loss is a major red flag indicating that the urchin is highly stressed. This is most commonly caused by poor water quality, a sudden change in salinity or temperature, or starvation due to a lack of algae.

Do I need to feed my Tuxedo Urchin?

If you have a large, mature reef tank with plenty of algae, they will likely find enough food on their own. However, if your tank is very clean, you must supplement their diet by offering dried marine algae (nori) rubber-banded to a small rock near them.

Is the Tuxedo Urchin venomous?

No, the Tuxedo Urchin is not venomous. Their short spines are relatively harmless, though care should still be taken when handling them to avoid accidental punctures.

MarineMarineIntermediate

Tuxedo Urchin

Mespilia globulus

The Tuxedo Urchin is a visually striking and exceptionally efficient algae grazer, renowned for its charming habit of carrying small pieces of debris as camouflage.

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Ideal Conditions

Temperature: 23 – 26 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.026 SG
Adult size: 4 – 7 cm
Standard nano reef or larger: 75 litres+
Lifespan: 3 – 5 years
Diet: Herbivore
Water flow: Moderate
Preferred setup: Established reef tank with ample live rock and algae growth

About the Tuxedo Urchin

Boasting a beautiful juxtaposition of velvety blue or black segments against reddish spines, the Tuxedo Urchin (*Mespilia globulus*) is a favourite among marine aquarists. Beyond its good looks, it is highly valued for its voracious appetite for nuisance algae. These urchins are famously known for their 'hat-wearing' behaviour, often picking up snail shells, coral rubble, and small macroalgae pieces to carry on top of their bodies, which helps them camouflage and provides protection from ultraviolet light.

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Where Tuxedo Urchin comes from

Native range

Indo-Pacific

Countries / regions

Indonesia, Philippines, Fiji, Australia

Habitat

Coral reefs, rocky rubble zones, and seagrass beds

Widespread across the tropical Indo-Pacific, typically found in shallow, sunlit waters where algae flourishes.

Similar species

Pincushion Urchin
Lytechinus variegatus
Halloween Urchin
Tripneustes gratilla

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful fish that completely ignore bottom-dwelling invertebrates.
Great
Scarlet Skunk Cleaner Shrimp
Lysmata amboinensis
Excellent peaceful companion in a clean-up crew; they occupy different niches and will not bother the urchin.
Great
Emerald Crab
Mithraculus sculptus
Usually fine, but a hungry or exceptionally large crab may attempt to pick at the urchin's spines or flesh.
Compatible with caution
Clown Triggerfish
Balistoides conspicillum
Triggerfish are notorious for attacking and consuming sea urchins by flipping them over.
Not recommended
Dogface Puffer
Arothron nigropunctatus
Pufferfish possess strong beaks specifically designed to crush the shells and tests of invertebrates like urchins.
Not recommended

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