Devonshire cup coral (Caryophyllia smithii) photographed under deep blue light to reveal its fluorescent pigments, showing up as green in this photo. Plymouth Sound, Devon, UK, English Channel, July  ,  2020VISION,ANTHOZOANS,ATLANTIC,CARYOPHYLLA,CNIDARIANS,CORALS,EUROPE,GREEN,HARD CORALS,INVERTEBRATES,MARINE,NIGHT,SEAS,TEMPERATE,UK,UNDERWATER,ENGLAND,United Kingdom,Cnidaria,2020cc  ,  Alex Mustard / 2020VISION