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So I picked his brain a little and he said if you want you will get the colors back when using more 6700 and 11000 k range bulbs.
I think this really explains why one of my tanks doesn't have pastel and the other one does. Each are 8 bulb fixtures with 4 Blue +, 2 Fiji Purples. The other 2 bulbs in the non-pastel tank are 6700k and 1100k. The faded bleached out colored tank is Aquablue Special and 11000k.
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Aquablue special is a 12k bulb. Is your guy saying there is a difference between 11k and 12k? Both Blue Plus and Aquablues have a huge 460nm peak.
One pet theory I have is that a lot of these tanks are loaded up with Blue Plus and AquaBlues both of which peak at 460nm. Perhaps 460nm is saturating the zoax but not doing anything for the pigments, who knows.
There was a thread where (JetCat I think, may be mistaken there) removed all or most of his blue plus to actinic and he almost immediately got better colors. Who knows.