Water Depth: less than 25m but not exposed to air;
Light: for photosynthesis;
Clean, clear water, sediment free,
Well oxygenated water produced by strong wave action;
Global Distribution Global distribution: Tropical seas between Tropics of Cancer and Capricorn. Offshore, on eastern and western continental and island margins. 92% of total found in Indo-Pacific region.
The 3D Theory of Coral Development The modern explanation of coral reef development should correctly be called the Darwin/Dana/Daly Theory (The 3D Theory!) of Coral Reef Formation since only the works of these three men taken together can fully explain the characteristics observed on atolls today.