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What I was trying to say in my previous post, rather inartfully, was that I don't think corals photosynthesize. Rather, the symbiotic zooxanthellae algae within the coral photosynthesize. Zooxanthellae contain pigments like chlorophyll A and C2. Chlorophyll absorbs light in the red and the blue regions of the visible light spectrum, but green light is reflected. The color of the coral belies the color of the zooxanthellae. Xenia are not photosynthetic, the zooxanthellae within the xenia are. "Photosynthetic corals" is really a misnomer.
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