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Presumably the nuc boxes have to sit flush on the QE? If there's no flow on and you have to feed syrup do the bees store it in the adjacent (non-grafts) nuc box ... effectively lower down the hive?
I'm not sure about that. There has always been plenty of nectar in the box I have grafted into so I can't be sure that they have not added more while the process was taking place. Remember that the plastic sheet is only in place for a few days so I doubt if you would notice a difference in stores increase between the 2 boxes during such a short time.