Been so busy and haven't done much reading. Should my 3 week old chicks be vaccinated and wormed? I only have 8. Got them from Tractor Supply. They are Red sex linked. They've been doing great. Fresh water and food everyday. I keep their coop clean and no other animals around besides our cat. Is it mandatory to vaccinate and deworm them? Just this evening I noticed one was not as energetic as the others. She doesn't even try to eat the shredded cheese snacks that the others are going Berserk over. Her eyes are clear, everything looks "normal". I'm confused.