Just a word to the wise, bought a few MM poly nucs (new design) put some treated syrup on yesterday in top feeder, checked today all 3 nucs have drowned bees on bottom of gap between feeder entrance / syrup wall. Gap between them too big maybe?
Just seen the same problem on a Maisies nuc that's just "come home" following the addition of bees & brood to boost numbers. I've put a strip of "modelling mesh" (handy stuff, btw) on the walls and bottom of the feeding slot to allow them to climb out of the syrup more easily. Hopefully that will sort things out.
Tony.