Other then not keeping up in growth, this little chick has been thriving with the others. This morning she's been acting listless, I thought it was just me, but now it's obvious! I don't know why she would be doing this. I'm already putting a little apple cider vinegar in their water, and I gave them probiotic two days ago for 24 hrs after introducing new chicks, the same age. I don't want to lose her!