Hermatypic coral

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Hermatypic corals, are corals that contain and depend upon zooxanthellae (algae) for nutrients. Ahermatypic corals do not contain zooxanthellae, and therefore rely mainly on plankton for nutrients. Both types contain species that may be considered "reef builders."

[edit] References

http://www.springerlink.com/content/t1lp02862675073l/