This video says about itself:
Fluorescent Coral Glows in the Depth of the Ocean | BBC Earth
18 May 2018
Researchers have identified the biological process of mineralization that occurs in a young coral that shifts from the plankton (swimming) stage to the ‘settled’ stage in which it forms the skeleton from minerals that protect its colony. The discovery is important for understanding the process of coral reef formation and protecting marine creatures from ecological damage associated with global warming, and could impact new biotechnological developments using coral extractions to regenerate and reconstruct human bones: here.