I agree with everyone. Run carbon and GFO to battle whatever is going on and reduce phosphates. .25 PO4 is quite high and would definitely cause some browning out of SPS. Judging by the pics, your SPS are RTN'ing. Chop off the good part of your SPS and mount them on frag plugs. That is the only way to potentially save them at this point. The second SPS get stressed, they can die off within hours. The die off will only cause more nutrients and can set off a chain reaction.
Water changes of at least 25% to even 50% would be good at this point to help reduce your nitrates, PO4, etc.
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