Common name: Longspine Urchin

Chaetaster is a genus of sea urchins commonly known as Longspine Urchins. They are characterized by their long, thin spines that can vary in color from red to purple or black. These urchins are beneficial in reef aquariums as they graze on algae, helping to keep the tank clean. However, their spines can be sharp and potentially harmful to other tank inhabitants if not handled with care. They are nocturnal and often hide during the day, emerging at night to feed.

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   Common name: Red Brittle Star

   Scientific name: Chaetaster longipes