Where did my anemone go?


I had a purple ritteri anemone and a couple nights ago it had white stuff coming out the middle of it then the next morning it was gone the anemone was pretty big about 8" across so i dont think it coulda got sucked up by any filter or powerhead but i checked anyways and its nowhere to be found i looked in holes in rocks and everything anyone have any idea as to what coulda happened?