Corals cover less than one percent of the ocean floor, but support about 25 percent of all marine creatures. Corals get their vibrant colors from the hosted algae. Coral colonies can live five years to several centuries and can be found in cold water. Various coral will extend tentacles or secrete films to collect organic particles, often nocturnal feeders; most nutrients come from the algae’s photosynthesis and they eat zooplankton and small fish.
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