I bought my first chickens this spring and have 12. One of the barred rocks seems to be a bit under the weather. It is awfully hot this week here in Central Florida but the others are all lively. Her tail is down and her eyes are not as open as the others. I just noted that she is also panting more than the others and at times seems to be trying to get something out of her mouth by opening her beak and shaming her head. I just now bought and put in the water some Duramycin-10. Should I be doing anything else? Sheseems to be eating well and is in good weight.