Pincushion Urchins have a body covered in hundreds of short, uniform spines that vary in color from pink, purple, white, beige, and orange. Pincushion urchins grow to a size of 6″. Pincushion urchins are excellent at controlling algae in a reef aquarium. Pincushion urchins may be seen with pieces of substrate or empty shells on their bodies; this is normal behavior, as the urchin uses these items to aid in camouflage. The Pincushion urchin is safe to handle