The Small Spiny Oyster is la arge sessile invertebrates with very colorful mantles, where its shell is shaped like a scallop?s shell, but it remains securely attached to the substrate on the aquarium floor, and doesn?t wander. With its bizarre exterior, the Small Spiny Oyster makes a captivating addition to any tank. It is a reef safe invertebrate that is most often kept by the home aquarist as an ornamental element in the aquarium. The shell has many ridges and spines giving the Small Spiny Oyster an unusual, unique appearance. It requires good water conditions with moderate to strong water currents, and causes no harm to either fish or other invertebrates in the aquarium. In the aquarium environment it is necessary to provide moderate to strong water currents along with dissolved particulate organic substances like marine snow, bacteria and phytoplankton. Calcium supplements are also necessary for ongoing growth of the Small Spiny Oyster. Calcium supplementation is necessary for the Small Spiny Oyster, as it is a crucial part of their ongoing growth and development. It is best to keep the Small Spiny Oyster in the tank not less than 25 gallons, and thrives well in a temperature range of 72-78 degrees Fahrenheit and pH of 8.1-8.4. Since the Small Spiny Oyster is peaceful, and moderate to care for, it becomes a good choice for an intermediate aquarist.