Coral polyps do not photosynthesize, but have a symbiotic relationship with "Symbiodinium"; these organisms live within the tissues of polyps and provide organic nutrients that nourish the polyp.
Coral polyps do not photosynthesize, but have a symbiotic relationship with microscopic algae of the genus "Symbiodinium", commonly referred to as zooxanthellae. These organisms live within the tissues of polyps and provide organic nutrients that nourish the polyp.