Blastomussa merleti and wellsi. Common name = pineapple coral According to "Aquarium Corals", Eric B says the B. wellsi can be distinguished by its corallites and polyps. They have a larger diameter of 4-5 inches, which is more than twice the size of B. merleti at mature size. He also indicates B. merleti forms long, tubular corallites that are brittle and easily broken from healthy specimens to form new colonies.
Great pics!