FWIW, the white parts look dead, not bleached. Bleached corals have tissue with little to no color. I believe there to be an absence of flesh in your pics. No flesh leaves the white skeleton exposed, at least until green algae starts to grow on it.
I sat in on a talk where rich from the steinhart was talking sps and phosphate. His phosphate level was 2.02 and higher with fantastic colors and even crazier growth. I don't worry about po4
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