I think he said his phos is 0 because he hasn't checked it lately. But you are correct if it is 0. Too clean and alk would cause the white.Unfortunately parameters is not everything otherwise we would all have the perfect tank. What works for one does not work for another. I noticed your Phosphate is zero. What fish and how much do you feed? What method do you use for nutrient export? The hammers do not look too happy either so maybe your corals are starving.