Victor,
Your comparing two different things here. Coral pigment is different then algae pigment. What was stated in my above post was the effect of blue light on zooxanthallae not coral pigment. Which is a whole nother issue that is not well understood. The type and intensity of light will cause different shades of brown in the coral do to how the zooxanthallae react to the given light. This is why people with low light reefs seem to have darker corals then those with higher lighting. I know other things play a part as well but we are talking lighting here, so I'll stick with that. I'm sure we all agree no matter what you do with your lighting you won't pull purples out of a toadstool. I suppose that the purple monster your refering to could very well be happy or healthly wether it's brown or purple. What does matter though is that it has a healthy zooxanthallae population to feed the coral in question. And IMO if the PM was in good health and growing it would have no chose but to be purple.
Also I think an Iwasaki has a much larger spike in blue light then a 5500k.
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Jamie Cross
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