i have a black silkie hen thats 8 months old with crusted eyes . they crusted shut last night. i moisted them up and they opened, but afaird it will happen again. i put her on terrmicyn powder in her water. any one else have this problem before? i have 25 other chickens they seem fine. her eyes have green/white dryed eye crusts, but other wise fine is eatting and pooping fine.