A few weeks ago this bird had a seriously swollen eye. Treated with terramycin ointment and then upped to tylan 50. Then Bob got it last week, wasn't very responsive to the tylan. But it didn't get worse.. No discharge, no sneezing, no other symptoms. Good mood. Good appetite, etc. Now 1st bird has it again - swollen on both sides of the face. They are in a LARGE coop, there are 10 of them. Free range every day... I think I dosed Bob too low. Need to reweigh him. Should I try the tylan again or something else? I have pen g in the house too. These are the first chickens I've owned and we built the coop. Thanks for any thoughts, suggestions, etc.