The balance between blue and white is more cosmetic, so dial in what looks good to you. Make any adjustments slowly if you already have some SPS
Water changes are the first line of defense from phosphates using RO
Many folks, including me, use a mixture of things to further reduce it, like GFO
and products like Purigen. I don't tend to go with more aggressive methods and like using organic binding agents like these. My algae scrubber/skimmer only pushes my phosphates to .4 ppm
, so I use GFO
and Purigen to get it down under .05 ppm
. I have a very large coral and fish bio load, so I have to be pretty thorough to grow SPS
in the system, but it all works. BRS sells a inexpensive reactor for these products.