Check your parems.
make sure your corals arent stinging them and fish arent bothering them (nipping at them or shrimp walking on them and bothering them.
other than that, idk
good luck with it.
I will try and get a pic of it to post when I get home in the morning. If just dont look good, it does look like something has started to nip at it, but my foxface has never bothered any of my other Soft Corals before, so I am not sure. He is very well fed, and I am sure he will be very happy when he gets in his new home here very very soon.....