Sea Urchin

Discover sea urchins at Infinity & Beyond Aquatics with unique marine invertebrates that bring fascinating texture and movement to your saltwater aquarium. Many species graze on algae, making them useful additions to a compatible reef cleanup crew.

Explore our selection to find the right fit for your tank. Check individual listings for adult size, feeding needs, and reef compatibility, and keep rockwork and coral frags secure as these determined grazers roam.