A group of Tubastreas, a non reef-building coral. The polyps are expanded for nighttime feeding.
Astrolabe Reef, Kadavu, Fiji - Depth 85 feet or 30 meters

 

 

 

*.  In the above habitat, we have a cluster of non reef-building (ahermatypic) corals.  They are commonly called Orange Cup Corals or Sun Corals, , probably (Tubastraea aurea.)