I've been experimenting with LEDs for many years and if I were building a fixture now I would simply use warm white, royal blue, violet and green. There's really no need for the regular blue in addition to royal blue and red LEDs add little either. But green is useful as it can stimulate some of the red pigments in corals etc.
I have a fixture I built many years ago. At the time I just used cool white and royal blue with 90 degree optics. When i put it back to use over my 120 gallon tank I added in some violet, red and green emitters without any optics just to add colour. It's working really well but I've found i basically have the reds almost turned off. I don't find them useful at all.
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