What test kits do you use are you sure you have no Nitrite, and Nitrate?
How old is your tank. What about flow is there enough flow/oxygen in your tank? Does not sound like a light problem to me. You PO4 is a bit high but should not kill things.
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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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