I'm a new chick owner, so every little thing makes me nervous . Today one of my six chicks seems a little under the weather. She's generally staying away from the rest of the flock, and standing by the heat lamp. She dozes off standing up a lot. Her poop seems fine, though I will continue to observe. She's a bit less active than usual, but she is eating and drinking normally. She is 3 weeks old. Should I separate her from the rest of the flock for fear of Cocci, or am I overreacting? Thank you .