Hi all. I picked up 4 chicks from the feed store 6 days ago and I've lost two, one last night and one the night before. They die within an hour of displaying any symptoms. I first notice them not being as playful and vigerous. The develop wry neck and walk in circles for 20 minutes and or so. Always loudly chirping which is heart breaking. The end up calapsing, not able to move and breathing heavy. They also had watery poo. Within the hour they passed away. They are on medicated starter and have super clean conditions with appropriate temperature. After the first chick died I added a chick boost supplement to their water. One is a barred rock the other is a golden sex-link. Any recomendations for meds? Thanks!