Common names include Velvet Horn Coral, and Horn or Knob Coral. These photosynthetic corals take several growth forms, e.g., flat colonies, thick branched colonies, and massive round colonies. Colors are normally cream or green, and the fluorescence of some make them very attractive. They are aggressive and can deliver powerful stings with sweeper tentacles, however, attacks usually involve acrorhagi or mesenterial filaments.
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