Spiny Oyster
(Spondylus americanus)

The Spiny Oyster is a large sessile invertebrate that remains securely attached to the tank floor or rock structure and does not move around. With their unique exterior, the Spiny Oyster makes a captivating addition to any tank. 
The Spiny Oyster is best kept in tanks with good water quality, moderate to strong current, and moderate light. They are peaceful and will readily take calcium supplements for better growth.