all my other chickens fine but all my SLW pullets keep getting sick with this white paste like stuff i clean it out everytime i catch one with bad eye and i dont know what causing it. they r in the same pin as my EEs and they r all fine. None of ther noses r running and theres no bad smell ive already had 3 die from it cuz it was get so bad and i got 2 more starting to get the same thing what is it??? what should i do? i clean out the coop everyday fresh cold water everyday. I got them from Ideal poultry hatchery they r 5 months old