Pin Cushion Urchin

Pin Cushion Urchin — Cidaris cidaris

The Cidaris cidaris Pin Cushion Urchin is a visually striking reef invertebrate with a robust, rounded body covered in long, rigid spines that fan outward like a pin cushion. It is a slow-moving, reef-safe grazer that helps control detritus and algae on rock and substrate while adding dramatic texture and color to aquariums. Its calm, stationary behavior and unique appearance make it a standout addition for hobbyists seeking both functionality and visual appeal.

Pin Cushion Urchins thrive in established reef tanks with stable water parameters, moderate water flow, and plenty of surfaces for grazing. Add only to mature systems to ensure proper nutrition and reduce stress. A minimum tank size of 30 gallons is recommended to provide adequate space for movement and foraging.

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 grazing. Target feeding helps maintain health and promotes 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.