08-14-2006, 07:26 AM
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Yes, Many, if not most aquarium corals contain within their tissue the symbiotic algae called zooxanthellae. It is these zooxanthellae that require light to perform photosynthesis and in turn produce simple sugars that the corals utilize for food. Therefore, the simple answer to light is to provide enough to maintain a thriving population of zooxanthellae in a corals tissue. In practice however, this can prove to be a very complex issue. If you don't provide the proper lighting needs the corals will became bleached. If that happens you can save them, but the chances of survival is low.