Well,
Foot pealing off,
Mouth gaping,
Looks like the foot is kind of starting to come apart,
A lot of people would tell you not to feed it. I would suggest feeding it, my reasoning behind this is that the tentacles aren't out, making its not getting the photosynthesis it needs to be healthy, so it has to get energy and and the strength some how. So by feeding it, it's getting its Nutritionals and energy to heal to be able to get is tentacles out to get photosynthesis in proper order. To be honest, i think it's a goner but you can try feeding and see if it has the strength to eat. But you are going to want to watch it very closely. The moment you start smelling any odor and the anemone look like it's melting amd turning to white goo take it out immediately.