Cushion coral, Cladocora caespitosa is a typical madrepore of the Mediterranean Sea, it belongs to the Hexacorallia class and to the Cnidaria phylum., It usually has a brownish, beige or dirty white color, this one in the video is unusually very white, probably because it is "still young". It is a colony of polyps that live in symbiosis with zooxanthellae algae. The polyps form calcium carbonate deposits that form the cells in which they live and that make the madrepore grow in size ...