Is this a reef tank? Anything under 10,000K encourages algal growth. It usually does have more usable light output than say a 20,000K bulb. I'm not sure what you mean about seeing the blue though, that sounds like an idea that wasn't really conveyed to you properly. CORAL Magazine has an article in their Nov/Dec 2011 issue called Blue Light & Corals which discusses the importance of blue light in the formation of more intense coral colors.
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~ Mindy
SPS fanatic.
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