Juergen Freund / Leather coral (Sarcophyton sp.) spawning during the annual 'mass' coral spawning event, in November, Great Barrier Reef, Queensland, Australia

Juergen Freund / Leather coral (Sarcophyton sp.) spawning during the annual 'mass' coral spawning event, in November, Great Barrier Reef, Queensland, Australia

Juergen Freund / A forest of Delicate sea whip corals {Juncella fragilis} Indo-pacific

Juergen Freund / Hard corals grow on a sponge that is attached to a gorgonian fan coral. Indo-pacific

Juergen Freund / Delicate sea whip corals {Junceella fragilis} Indo-pacific

Juergen Freund / Red whip corals (Ctenocella pectinata) with Featherstar (Crinoidea) attached, Indo-pacific

Juergen Freund / Close-up of an Acropora coral, Indo-pacific

Juergen Freund / Colourful gorgonian sea fan (Gorgonacea) and soft corals, with diver in the background. Rowley Shoals, Western Australia

Juergen Freund / Silhouette of diver behind large Sea fan coral {Gorgonia flabellum} Caribbean

Juergen Freund / Close up of mouth of Sea anemone {Heteractis aurora} Indo pacific

Juergen Freund / Close up of trunk of Alicia sea anemone {Alicia mirabilis} Mediterranean

Juergen Freund / Alicia anemone (Alicia mirabilis) Mediterranean Sea