Oh no. If it was dying, it would basically be a ball of gooey crap. The anemone I had used to ball up on a regular basis, and I learned that it was pooping. When it died, it drew up into a smaller ball and turned to mush. Anemones are testy and do funny things, but yours looks fine. That's my opinion, but someone else on here may know more about them and has more experienced advice for you.