I have one 7-8 week old roo showing signs of cocci (bloody stool lethargic) I am treating him with milk and he is separated. All the brooders are kept clean, have a bit of DE in them, and they all get clean water with ACV. None of the other birds seem to have it though, or at least all their poo is normal and they are acting normal. Could it be that this particular chick has a week immune system and thats why it is effecting him in this way, or am I on the cusp of a big problem???