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You can turn the light to white and blue equal, say 50% each then take the picture. Once you took the picture, I would consider increase white by 10% weekly until you reach 100% on both.
I like crisp white light better then an all blue tank. There are so much more color instead of just the fluorescent color green and yellow.
I originally had the tank at 100% for both but turned down the whites as some toxic hammers started becoming more purple. Read somewhere that it may be due to not enough blues, so I turned down the whites thinking that would help.