Hello! I have a pair of Show Silkies about 8 mths old. They are very lethargic, coughing and snoting. Won't open eyes all the way. I can feel how bad they feel. Started with Corvid 5 day treatment. Didn't help, picked up VetRx added to water for 5 days no corvid. Poor things are getting worse! Three other silkies are with them.... which was my original mistake. I didn't quarantine the new birds. What do I need to give them? I'm semi new to chickens. I've raised some from eggs some were bought. Havnt had this issue before and im so scared im going to loose my babies. They are kept indoors. No big change in temperature. Roo has stopped crowing. Been 2 weeks now.