I have a nuc that was queenless. I added a frame of eggs and they built a queen cell. I haven't been back in since I saw the cell (a week or two ago). My only concern there was that the cell was very dark. I don't know what that means - maybe just that it was ready to hatch. But I worried that it might mean it was not a prime cell. I will do an inspection today or tomorrow and see if I can find a queen in there. IF NO QUEEN, it would be basically a standard split and should be no problem, unless laying workers have started. IF LAYING WORKERS, can't I just shake off all the bees in front of the box and then add the queen to the box? Would that be sufficient?