Does not look like bleaching to me it looks like a water quality issue.
How old and what kind of test kits do you run? I think your problem is there it is unusual to have that high a PO4 and no NO3
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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