Duncan Corals are members of the Dendrophyllidae Family. They are characterized by their disc-shaped body and short, purple or green tentacles that they can quickly retract into their skeleton. Duncans are large polyp stony (LPS) corals that have gained popularity in the US these past few years. Duncan Corals are friendly, easy to care for, and grow pretty quickly. What's not to love? I would recommend one to any Reef Chaser.