I have kept both anemones and frogspawn in my 27gl for over 6 years now. I would say that let nature do it's thing for now, however if one or the other is being stung then I would move the anemone. In nature there are forces of current and space that we as hobbiest just cannot provide in a home aquarium. With that said, if the anemone needs to be moved, simply place a rock on the downward slope side opposite to the side where you place a small powerhead to force it to creep onto the rock, now you can move the anemone attached to the rock so yuou don't have to pick it up. I have done this a few times with ease. Just be sure you don't go making blended anemone cocktails-be sure to monitor while performing this action as it should only take an hour at most.
So I guess I agree with everyone
cheers, Rich