Purple Pin Cushion Urchin — Cidaris cidaris
The Cidaris cidaris Purple Pin Cushion Urchin is a striking reef invertebrate with a rounded, rigid test covered in long, vibrant purple spines that resemble a pin cushion. Slow-moving and reef-safe, it grazes along the substrate and rockwork, consuming detritus and contributing to natural tank maintenance. Its unique coloration and dramatic appearance make it a standout addition to both beginner and advanced reef aquariums.
Purple Pin Cushion Urchins thrive in established reef tanks with stable water parameters, moderate water flow, and plenty of hard surfaces for grazing. Introduce only after the system is mature to ensure adequate nutrition and minimize stress. A minimum tank size of 30 gallons is recommended to allow room for foraging and movement.
Their diet can be supplemented with finely powdered or pellet foods from San Francisco Bay Brand, Hikari, PE, TDO, and New Life Spectrum, alongside natural algae and detritus grazing. Target feeding helps maintain optimal health and vibrant spine coloration.
Approximate product size: 2"–3" (varies by availability)
We maintain a rigorous, veterinarian-approved quarantine program that includes proactive treatments, careful observation, and daily monitoring to ensure the highest standards of invertebrate health. Our biosecurity practices reduce the risk of any cross-contamination between systems, meaning our livestock are ready for your display tanks.