These man-made Hammer colonies are gorgeous. Each head is around 1" in size.
Classified as a large polyp stony (LPS) coral, Hammer corals (Fimbriaphyllia ancora, once belonging to the Euphyllia Genus) consist of a hard a calcified base and puffy, tubular polyps. Hammer corals are named for the flat, hammer-shaped tip at the end of each polyp. Fimbriaphyllia paraancora, Branching Hammer corals, are very similar, but the skeletal structure will grow into separate corallites or "heads." Found in a wide range of green, brown, pink, peach, purple, blue, and creamy beige shades. Hammer corals are very popular in the reef-keeping hobby.