Longspine Urchin

Common Name: Longspine Urchin
Latin Name: Diadema setosum
Max Size: 6–8 inches (diameter)
Temperature: 72–81°F
pH: 8.1–8.4
Reef Safe: Yes, with caution

The Longspine Urchin is a striking species known for its extremely long, thin spines and elegant appearance. It is an effective algae grazer that helps control nuisance algae in reef tanks. While generally reef safe, caution is advised as its sharp spines can injure other tank inhabitants and it may occasionally damage delicate corals. Best suited for experienced aquarists with mature reef setups and plenty of space.