Last end of summer I had to buy corid to treat my chicks. The feed store didn't have small bottles so maybe I used less than 5%. In April I am getting new chicks and was wondering if the corid I have Can be used in case I need to treat them too. Also what is the best way to store liquid corid. I had mine in an unheated basement and we are in Chicago. My guess is it could have frozen a few times.... Is it worth keeping and using it?