Decorator Urchin

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The Decorator Urchin is a fascinating and highly effective algae grazer, best known for its habit of collecting pieces of algae, rubble, shells and other loose material on its body and spines. This natural decorating behaviour provides camouflage while making each individual unique.

It is an excellent addition to established marine and reef aquariums, where it spends its time moving across rockwork and hard surfaces while grazing on algae and biofilm. Decorator Urchins are generally peaceful and reef compatible, although they can accidentally move loose coral frags or decorations as they explore.

Provide plenty of natural algae and secure lightweight rockwork and coral frags.

Quick Care Guide

• Scientific Name: Mespilia globulus
• Difficulty: Easy to moderate
• Lighting: Any standard reef lighting
• Flow: Moderate
• Temperature: 24–27°C
• Salinity: 1.024–1.026 SG
• Diet: Algae, biofilm and marine algae foods
• Minimum Aquarium: 75L+
• Placement: Live rock and hard surfaces
• Temperament: Peaceful
• Reef Compatibility: Generally reef safe
• Activity: Active algae grazer

FAQ

Why does the Decorator Urchin carry things on its body?

It naturally collects loose materials such as algae, rubble and shells for camouflage and protection.

What does a Decorator Urchin eat?

It primarily grazes on algae and biofilm growing across aquarium surfaces. Supplemental algae foods can be provided when natural algae is limited.

Is it reef safe?

Yes, it is generally considered reef compatible. Its main concern is accidentally moving loose corals or decorations.

Will it help control algae?

Yes. Decorator Urchins are effective grazers and can help keep algae under control in established aquariums.

Common Mistakes

Adding one to an aquarium with no algae

Urchins need a reliable food source. Supplement their diet if the aquarium becomes too clean.

Leaving coral frags unsecured

Their strong movement can accidentally push or carry lightweight frags and decorations.

Removing everything it collects

The decorating behaviour is completely natural and helps provide camouflage.

Handling it carelessly

Urchin spines can be sharp and should be handled with care.

Unstable salinity

Urchins can be sensitive to sudden changes in salinity, so careful acclimation is recommended.