She is still eating, no nasal discharge than I can see, and her eyes are clear. She does seem kind of lethargic, but not in a stupor. She has been the smallest of a group of 8 mixed chicks from the start. They are inside, with a heat lamp, in a box large enough to get away from the heat when they want. Should I get some meds from the farm store? What would be best, considering the other birds aren't showing symptoms (yet)?