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You could turn over the rock, if possible. The nem would likely readjust.
Leave it alone and wait.
I wouldnt change anything. If you increased your photo period, I would go back to what it was.
You dont know what the anemone is doing, and all of your other anemones are fine.
Changing the photo period could very well trigger issues with the other anemones and still not do anything to "fix" the issue with the first anemone.
I know it's hard, but sit and wait. If your other anemones of the same type are fine, it's not a water quality issue or an environmental issue.

