We brought home 9 chicks last Wednesday. 7 of the 9 seem to be doing great, but as of Saturday two started acting funny. Our olive egger in particular wont walk for more than a few steps and will only get up if provoked. She mostly just lays in the sand and twitches her head a lot like she's trying to shake water out of her ears. She does seem to be eating and drinking occasionally, but not nearly as much as the other chicks. She is definitely getting out grown. The video linked below shows her behavior. We've started dosing the entire flock with Corid, even though her droppings seem normal. Is there anything else we should be doing or are we being crazy?
She's the one in the middle of the frame getting stepped on: