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How’s it doing?
How old is your tank? It looks less than a year old.
Get it away from the peppermint shrimp. Those things eat everything it seems. If you saw them pick at it once, then they are probably still eating it when you aren't around to watch. Doesn't matter which ones go where, but they do need to be separated. Besides, they are eating your corals too. There could still be an infection from the wounds inflicted by the shrimp. Not sure how to treat serpent stars for infection.
I hope he recovers.
Peppermints aren’t helping in the cause.
I would suggest to take a water sample to a trusted LFS and have them test the water and see what readings they get and to compare with your tests