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From The Aquarium Wiki

Please copy and paste ' [[Category:Coral (Saltwater)]] ' into the end of your article to include it in this category.

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Corals are marine animals from the class Anthozoa and exist as small sea anemone-like polyps, typically in colonies of many identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.

When buying any sort of coral for a reef tank it is important to make sure that the coral was sourced from an aqua culture and NOT the wild.