I have the same lights over my 6 foots tank right now. I use 2 URI super actinics 2 fiji purples and I use 2 XM 10K bulbs. I get great growth and the color seems very natural to me. I used 15K's for awhile, but the coral liked the 10K's better, so i'm sticking with that for now.
A lot of personal preference in what you like, some people want their tanks like some techno nightclub, others don't like that UV look.
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