I want to emphasize what Steve and Brad were alluding to. There are few objective measurements made in this hobby, and attributing coral growth strictly to light spectrum would be a mistake. Best to worry about looks first and technical findings second in this case I think.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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