Alex Mustard / Shallow coral reef flat with corals (Pocillopora damicornis, Acropora humilis and Pocillopora verrucosa) in evening light. Gordon Reef, Strait of Tiran, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Juergen Freund / Blue sea star on massive Boulder coral (Gardineroseris planulata) North Sulawesi, Indonesia. This coral species is normally found from the Red Sea to Central America, and is relatively uncommon in the...

Juergen Freund / Diver swimming over massive boulder / Cauliflower coral (Gardineroseris planulata) Buyat Bay, Sulawesi, Indonesia.

Juergen Freund / Massive boulder / Cauliflower coral (Gardineroseris planulata) with blue sea star, Buyat Bay, Sulawesi, Indonesia, Indo-pacific.

David Fleetham / Dwarf scorpionfish (Sebastapistes fowleri) in Cauliflower coral (Pocillopora meandrina). Kauai, Hawaii.

Alex Mustard / Hard coral (Pocillopora damicornis) spawning during the morning on a coral reef. The Alternatives, Sinai. Egypt. Red Sea

Alex Mustard / Hard coral (Pocillopora damicornis) spawning during the morning on a coral reef. The Alternatives, Sinai. Egypt. Red Sea

Sue Daly / Cauliflower soft coral (Drifa glomerata) Trondheimsfjord, Norway, July.

Doug Perrine / Plate and Pillar coral (Porites rus) and Cauliflower coral (Pocillopora meandrina) bleached by warm sea temperatures during 2015 El Nino event, Honaunau Bay, Kona, Hawaii, USA.

Juergen Freund / Massive Boulder coral (Gardineroseris planulata). Buyat Bay, North Sulawesi, Indonesia.

Alex Mustard / Diver swimming along reef, above soft coral (Dendronephthya klunzingeri) Jackson Reef, Strait of Tiran, Gulf of Aqaba, Red Sea. Sinai Egypt.

Alex Mustard / Colony of Cauliflower coral (Pocillopora damicornis) coral spawning gametes. Photographed one to two days before new moon. The Alternatives, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.