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The neutral whites would nuke your tank if you ran them at 3000mA, also I'd recommend the cool whites. I run all my LED's at 750mA so it's not like you need to overdrive them... To answer your original question you don't have to have any whites, I know a couple of people farming corals under only blue LED's, but you'd probably get a better range of colors with 2-3 cool whites in there.
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I don't always grow frags... but when I do, I prefer Dos Acros
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