SPS newly question

[Aquattro]

If it were my tank, I'd do a water change big enough to cut the NO3 by 25% minimum. The PO4 is suspect with a NO3 reading that high. Alk is a bit on the low side, I'd raise that to over 3.00.
Lastly, I'd raise the temp to 78-79. I've found that the growth rate increases dramatically at 79 over 75, and without enough growth, you won't get the corals healing any damage quickly enough, so exposed tips could start growing algae, and downhill from there.
So even if you fix everything else, the corals are still in danger from the existing damage. Elevated PO4 will also slow growth, so double check that with a hanna if possible.