After much research I purchased Tetracycline Hydrochloride soluble powder and am treating all 6 of my flock in their water. I plan to treat for 7 days and toss their eggs for the 7 days and then 4 days after. Im new to the chicken world and am just trying to figure it all out from sites such as this one. The only symptom I could see was her eyes were foamy. Shes eating and drinking. The feed stores in my area were sold out of injectable Tylan so I chose the Tetracycline. Any input would be greatly appreciated!