dying anemone

Hi everyone, 6 months ago I started my first reef tank, everything looks fine, and all the water parameters are perfect, the only problem is my anemone, or part of my anemone is dying, I read terrible story about dying anemone killing everything in the tank and now I'm not sure if I should take it off the tank.
I appreciate any help.
I attach a photo of my anemone.

Thanks in advance, Francesco

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