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There are 2 things going on here... assuming I understand your question.
Coral's basic colors will look different under different spectrum of light because it's reflected light. If you don't have the proper spectrum in your light (the light, not the fixture) then the proper color can't be reflected back to your eyes.
Hold something red under all blue light in an otherwise dark room and it will look almost black. That's because there is no red spectrum in the blue light to be reflected.
The other way that corals show color is by fluorescence. This is where the pigment of some corals can take in high energy light (like blue, violet & UV) and use that energy to do a chemical reaction and produce it's own light (fluorescence). That's why under all blue light your corals can show a full range of colors. They are making their own light!
You might also notice that although blue corals do look blue under all blue light (it's reflected), it doesn't 'glow' like the other colors because the chemical reaction uses some of the blue lights energy and therefore can't produce high energy blue light to fluoresce.
And in a tank with a lot of blue light and some white light, you'll have both reflected light and fluoresced light. The higher the percentage of blue, the more the colors are fluoresced colors. The higher the percentage of white, the more the colors are reflected colors.
Does all that make sense? More importantly, does it answer your question? ;Hilarious
That makes sense. But does spectrum also affect what pigments the coral make? I see anecdotes of coral sellers growing under 6500k and then coloring them up with blues. Is this true?