Hi. One week ago today I bought 6 chicks from a local farm store. Four are pullets that are a little over a week old and the other two are 3 week old bantams. They all seemed healthy enough but now they are sneezing alot. These sneezes sound very wet. I haven't noticed any discharge from their nostrils or any liquid coming from their beaks when they sneeze. They are very active, and eating & drinking well. My question is how much medicine should I be mixing in their drinking water? I have Tetracycline powder. When I brought them home I was putting a vitamin & electrolyte powder in their water but stopped after 4 days. I then started the Tetracycline at a rate of 1/2 tsp per half gallon of water. They started the sneezing yesterday. I don't want to overdose them, but not giving them enough antibiotic is bad too. I mix up a half gallon at a time and change their water every three hours during the day. Any advice would be appreciated. Thank you.