Our first and only two month old Silver Phoenix roo is very lethargic. We noticed he was moving slow yesterday and is worse today. No runny nose or cough. Drinks a tiny bit of water with acv but refuses chick feed. I am worried he may have slept on the ground instead of the perch and gotten chilled? The weather has been very damp the past few days. So now he is inside in a ventilated box with his own water with acv and food. The other chicks his age (not Silver Phoenix breed) seem fine. I appreciate any suggestions and ideas as to what is wrong. Thanks