I bought a nuc in May with 2011 queen which build up nicely until recently. I gave them a super about a month ago, and gave them a 1:1 feed the week before. They didnt take the feed and didnt go up to the super. The queen is still there but the brood box seems to have uncapped stores in the centre and I didnt see any eggs. Bees had also gone quiter than previous (they were a little bit cross previously). Any ideas/suggestions. I'm a beginner this year so apologies if there's an obvious answer here.