IMO Its dificult but possible. They will get real big tho and will sting all the corals around it.
so it would have to be a tank focused only on the bubble tip.
With a 12GNC you are very limited on what you can put in there, please add anemone to the list of things you can't put in there. None of the hosting anemones should be kept in anything less than 29 gallons, IMO.
Thomas