HELP What's up with my poor Sinularia?


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I first saw this about a week ago. It hasn't progressed or gotten better, since. I was wondering if my filefish might have taken a bite out of it when I wasn't home....
but now I am not sure. Any thoughts? I'm hoping I don't have to pull it out, because it's growing on a pretty large rock, but I will if I have to. It's been in my tank for about 6 months and has been perfectly fine. Thanks in advance, friends!!!