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That "Fire in the Water" is light produced by bioluminescent dinoflagellates, little plankton that are related to those that cause red tide. These ones aren't harmful, though. They light up when agitated by prop wash, wave action, fish moving through them, anything that disturbs them. If you are interested, a friend of mine (Vincent Pieribone) wrote a book on them and their use in medical research called (A Glow in the Dark). Good book.
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