I have a small flock and just added a new roo and 2 hens. Yesterday one of my older hens died and another hen looks like one of her eyes is closed up. I checked last night and a different hen has really watery eyes with tinny bubbles it looks weird. A couple times I saw one hen opening her beak for an extended time as well. All 3 of the new birds are acting fine and appear to be in great shape. I'm really confused because I've kept a small flock for many years with no problems like this before.