i have 9 chickens that I hatched they are almost 6 months old.the moms are red sex links and the dads were a mix(idk). A few lay blue or green eggs and all the girls have started laying in the last 3 weeks. I noticed a few of them started twitching their heads about 2 weeks ago. I have one that I hear the odd sneeze from and she seems to be twitching the most. They are all eating and drinking. They get fresh water 2x a day and every other day I put some avc in. I’ also give oatmeal with some garlic and a few drops of ooo. I buy non gmo food however the last bag I bought has been grower and I have a separate container with oyster shells. I brought said chicken in today and gave her a bath and checked her for lice and mites and didn’t see anything. Any advice what this could be? Video of her twitching https://instagram.com/p/BfUFuPRhWWp/