Sea Urchins

Sea urchins are spiny, round marine invertebrates belonging to the phylum Echinodermata, closely related to sea stars and sand dollars. They use their tube feet and movable spines for movement and defense. In saltwater aquariums, sea urchins are valued for their algae-eating habits, helping to control unwanted growth on rocks and glass.

Common species like the Tuxedo Urchin and Pencil Urchin are popular for their usefulness and unique appearance. They require stable water conditions, plenty of live rock, and a peaceful environment to thrive.