Hi there, I'm a new chicken mom we recently gained 5 chickens and two of the 5 have come down with some sort of respiratory illness. We started the tetracycline a week ago tomorrow and we have yet to see any improvement. The bag says not to exceed 14 days I'm curious to know if we will see any improvements in the next 7 days or if we should look into a new remedy. Has anyone else used tetracycline and noticed change right away or did it take a while? Both chickens are eating great, the heat is insane here so not much laying but they seem perfectly healthy until they cough or sneeze, Any help would be greatly appreciated!