So I noticed two sick chicks about a week or two old out with mom today. I grabbed them this evening and brought them inside to their own brooder and fixed them some corid. I made a gallon with 2 tsp corid. Made them drink some and put them under the heat plate. Just checked on them and one has past and the other is barely alive and passing as I type this. I can’t help but think the mixture I made them must be bad or too strong or something to have them pass so fast after treatment. The bottle was previously opened with a small slit in the top. I treated a chick a few months ago with it. Could it have gone bad?