I have 5 about 3 week old chicks. Got them one week ago. Tonight one got real lethargic, but was peeping loudly. Within an hour she was gone. Now another one is getting lethargic, but not peeping. The only thing I have on hand is some Terra-VEt, tetracycline hydrochloride. I also have some Vi-tal, which is a water vitamin, electrolyte and mineral supplement. Does anyone have any advice? Should I give them all some of each in a dropper? Please help!!!