I'm glad there's no more bleeding, Katy-may, just keep a careful watch on Rolex and make sure nobody picks on him. Why are you thinking of separating Miss Millie? If anything is going round she'll most likely have come into contact with it by now anyway. Unless you feel it's really necessary, it's best to keep them together unless one of them is obviously ill or injured, or there will be problems when you try to re-introduce the separated one to the others.
What are you feeding them? As they're not vaccinated, are they on chick crumb with a coccidiastat in ( ie stuff to prevent coccidiosis.) It sounds as if they haven't got cocci but they are still at the vulnerable age and if their immune systems aren't firing on all cylinders ATM, they may be more open to infection. Try to keep the floor as clean as possible where they peck around in, and watch out for any runny poos or blood. They will be nice and warm in the shelter of indoors. Do you think perhaps they got a bit chilly when you had them in the greenhouse overnight last week? It's hard work bringing up winter babies, isn't it?
Glad the cat & dog are OK. You have quite a hospital going there1