selective color of teal coral reef underwater photography
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Editorial, Travel
Published on NIKON CORPORATION, NIKON D750
Free to use under the Unsplash License

These corals contain proteins which are luminescent, so that they glow in the dark. This helps the associated algae to photosynthesise in dark, deep waters, which in turn feeds the coral animal, while the wastes from the coral animal fertilize the algae.

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