so long story short here last week I introduced a sick hen into my current flock last fri I put them on water solub tylan for 3 days at a low mix rate cause my family eats the eggs from our birds we have 15 in total. the sick bird did recover and yes I treated entire flock. now tonight one of my good hens I noticed she's not herself just hanging out closing eyes gasping for air I now noticed her eye has foamy bubbles in it. well crap what do I do now? pull her treat her seperate or can I put entire flock back on tylan at 1 tbsp tylan to gallon of water for 3 to 5 days? I hate using drugs but what can u do I am using vet rx and oregano and ac in water but I cant seem to get rid of this respority issue in flock so I need best advice and options. thank u she's eattin and drinking just not herself thanks Dave m