I think this is right. It fits the description from Liveaquaria and confirms this is LPS:
The Merulina Coral is a large polyp stony (LPS) coral also known as Lettuce, Cabbage, Ridge, or Ruffled Coral. Most aquarists will receive the species M. ampliata that commonly lives in lagoons and other sheltered areas of the reef. Merulina Coral colonies begin life as an encrusting coral. With time, growth, and prevailing conditions, they start to develop the more spectacular structures that have made them famous with reef aquarists everywhere. It is normal to see the intricate skeleton frame through its skin. Fan-like plates are usually the first to form. More plates then form in the center of the fan, creating a ruffled appearance that truly resembles a head of cabbage or lettuce.
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