I have a d'Uccle cockerel that's around 4 months old and today I noticed that he has a eye that's swollen shut. Its very watery and has some crust around it. I tried to clean it the best I could. After that I noticed another d'Uccle pullet(same age) that had the same eye problem. It wasn't as bad though and wasn't swollen shut, it was a little bit swollen and also had some crust around it. We got the d'Uccles and most of the other birds in that pen as chicks from a hatchery. We have added some birds since then(some hens and some roosters) but they were quarantined, it is possible that they could have had some contact with the others it was just to get them used to each other though. They get fed chick grower/finisher feed and they sometimes free range with the others. What is this and what should I do or is this something not to worry about? I'll try to get pictures if needed. Thanks! Also, I haven't noticed anything else odd about them, they act perfectly normal.