Short Spine Urchin
Short Spine Urchins are also known as "Rock Boring Urchin" and "Burrowing Urchins" because of their propensity to dig and bore their way into the rocks where they live. Because of this, make sure any aquarium that has them has very strong, stable rockwork. Short Spines are sometimes found with a commensal shrimp from the Althanas genus, though this pairing is infrequently seen in captive aquaria.