Anemones will die slowly under inadequate lighting.
Not saying yours is, just that it could take months to see it.. I'm not an expert at anemones.
I will say that anemones should be tried only with well established tanks with optimum water quality, under sufficient lighting. Never buy anything with the attitude of "I hope it survives..."
EDIT:
Sorry, lol, forgot to mention how nice your live rock looks. I reall like the way you positioned it!