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Awesome thank you so much I will try it outSet the fixtures just high enough so the light covers the bottom of the tank.
I used to run mine at 80-90% blue and 30-40% white. Blues for 10 hours and whites for 6 at midday.
Hope that helps?
I used to have that light over my frag tank and it had some serious hot spots. I borrowed a PAR meter and found that 20" above the water finally had it spread out enough. That said, I was using a single one to cover a 36" tank, and you're using two for (I think) a 48" tank so I don't think you need to worry about going that high.
I always had blue at 100%, and then whites at like 20%-30%. This video might be a good reference for your tank: