I have lost 2 chickens in the last 2 months. The first one acted a little strange for a week and then just died. She was a slw. Now this month my red chicken that I got from a neighbor last year has died. She kind of acted the same way but only for about a day and then died during the night. any suggestions? Thought about some antibiotics in the water and treating all the rest of them for a couple days. Any other suggestions??