Pencil Urchin

Pencil Urchin (Eucidaris tribuloides)
The Pencil Urchin is a unique and hardy species known for its thick, blunt spines that resemble miniature pencils. Native to Caribbean and Florida reefs, it grazes on algae, detritus, and biofilm, helping keep rockwork and sand clean. Peaceful and low-maintenance, Pencil Urchins thrive in established tanks with stable water conditions and plenty of surfaces to explore. Their unusual appearance and slow, deliberate movements make them a fascinating addition to reef and fish-only setups.

Quick Facts:

• Care Level: Easy
• Temperament: Peaceful
• Maximum Size: ~4 inches
• Minimum Tank Size: 30 gallons
• Diet: Herbivore/Omnivore (algae, detritus, biofilm)
• Reef Safe: Yes