Before I ask my questions here are my flock basics. 15 eleven month olds (Polish, EE and couple brown egg layers) and 4 guineas housed in large coop, 7 three month olds (farm hatched mixes) housed in small coop, 5 EE (6 weeks old) housed in cage inside large coop. 3 three week old banties in a brooder box in the house, 1 one week old banty in a separate box in the house. 12 day olds are being shipped today. My plan was to put the week old banty in with the standard chicks, then when they were a week or so old add the three banties in. However, now one of my 3 week old banties is sick. I started with four and one died of the same thing last week but I don't know what it is. I can't separate her from the two boys because I don't have enough space with the new chicks coming. I figure they were already exposed last week. How long should I keep them separate? And then what if it is something like coryzoa that they are carriers? I got those chicks from a feed store, the same one the EE's came from. My only thought was to forfeit one chick and put it in with them and see if it ends up sick also. Do I vaccinate by flock? I've heard that makes them carriers. I'm the only one caring for all the chickens so how to avoid spreading something when I don't even know if it is contagious? Now I am also nervous about putting my one tiny banty (we incubated)- who comes from show stock in with hatchery chicks that may or may not be ok. Am I worrying too much? What is the safest way to get new birds? I don't mind hatching but then I end up with the rooster problem and I already have 8 of those problems after rehoming 9 of them last year. Even when I order pullets I still end up with roos. Next thing is my son is in 4-H and they want to do a petting zoo. Is it safe for my chickens? Any advice on my complicated flock? I love my chickens but right now I feel like I am juggling, trying to keep them all safe and healthy.