At greater depths it is usually plate-like[3] and in caves and under overhangs the plates are angled to receive the maximum amount of light.

This happens when part of the coral has died, and the living tissue in between the dead patches continues to develop, giving a clumped effect.

The coral also obtains an important part of its nutritional needs as a result of the photosynthesis performed by the zooxanthellae in sunlight.

[4] The polyps contain stinging cells known as nematocysts to try to ward off the stoplight parrotfish,[7] other reef fish, snails, worms and starfish that feed on it.

[5] The IUCN Red List of Threatened Species ranks this coral as being of "least concern" as, within its range, it is widespread and common.

Compared to other members of its genus, it is resistant to disease and bleaching and lives in deeper water so may be less affected by rising sea temperatures.