Hello, I have 7 pullets that I received from Murray McMurray as 4 week olds, a little over one week ago. This is our first experience with owning chickens so I don't have much knowledge to pull from. The pullets were all vaccinated for both Mareks and Cocci at the hatchery. I feed them medicated chick feed. They were given Save a Chick electrolytes and pro-biotics for the first 4 days I had them. They are in a 50 gallon galvanized tank with a 250 watt heat lamp at one end and have wood stall pellets as bedding. They are indoors in an unheated room in our house that is not drafty but does stay cooler than the rest of the house. They sleep in a pile under the lamp at night but do not stay under it during the day. I have noticed that one of the barred rock pullets has been sleepier than the others. Additionally, her back looks odd, with her tail tucked down and the area above her tail is sort of humped looking. I put her in a box by herself for a few hours today so I could try to see her droppings. One was very runny (first one in the box) and the second one was nice and solid, normal greenish brown coloring. She does not have feathers under her wings, the skin is still smooth and pink. Is it possible she has cocci even though she has been vaccinated and is on medicated food? If not, what other illnesses may cause her to act lethargic and odd looking feathers?