Resptary issues are common throughout flocks.. I would look up some similar threads.. Just keep an eye on them.. If you see them start wearing or nose or eye discharge, get some electrolytes that dissolve in water.. They are at the feed store also their are various dissolvable antibiotics for respiratory issues.. Look up some foods that will books their immune system.. Boiled eggs are one that I know of,, just cutting it up so it does not have the egg shape ... Lol.. Well I know how it feels.. I am very new to this.. Last week I thought my Easter egger had a respiratory issue and lost sleep over it.. It turns out the little bugger had cracked corn stuck in her throat.. Well I truly wish you luck and your flock will be fine!!