The tentacles will most likely never bubble again unless you change tanks, lights, flow or something like that. IME they bubble when stressed. Nobody really knows why the tentacles change, but it is just as healthy. What lights do you have? It may be trying to get more light. Also, don't feed it more than once a week. If I feed mine even twice a week they will die because food rots inside of them and makes them unhappy. Best of luck!
I have T5 54w 6 bulbs in my 90 gallon. Its plenty of light and the rock crevice that it has wedged itself into, the anemone has not moved from it since it found it. I used to feed it everyday and it grew fast. So I cut down feeding it. It never got sick coz it ate too much.