Only fish are 2 clowns, 2 firefish, watchman goby and a pistol shrimp. I haven't seen any bothering it. I've seen some crabs walk over it but they weren't picking at it.While it is obviously unhappy, it can most certainly be saved. I've seen them come back from way worse.
What fish are in the tank? They are easily picked on by coral nippers.
Do you have a screen top? If you do, move it back to its original location and use a piece of paper on the screen top to shade it.
While I agree with others that getting your nitrates up to 5ish would be beneficial, i wouldn' go making drastic changes to your system if everything else seems happy. Maybe try feeding the whole tank more each day.
For now, I lowered the skimmer gate, put the trachyphyllia under an overhang, and I'll feed a bit heavier.
We will see how it goes. Like I said, it clearly isn't dead, but it isn't doing well. Is a week usually enough time before I would start seeing issues from too much light?