The Pin Cushion Urchin like some other types of urchin will hide during the day and will come out in the dark to look for algae to eat. With that they will need plenty of sturdy rocks so they can move around. If your aquarium is low on algae dried seaweed will do. They will also pray on small inverts.
Care Level - Intermediate
Tank Requirements -10 gal minimum
Reef Safe - with caution
Temperament - Peaceful
Diet - Omnivore
Current Size Approx. 1 inch
Full-Size -Approx. 6 inches
Water Parameters - 0ppm, 72-78F, pH 8.0-8.3