Hi! I have a broilers chicken that is 4 weeks and 4 days old. Last night I noticed it didnt seem to be moving very well. Legs stuck out in front and unable to get up to standing. I brought it in, it ate and drank water when it was placed in front of it. Currently we are feeding 18% grower crumble as well as ive been putting electrolyes in the water. I kept her in a box propped up on some tissue over night and she was settle. She did have a poop that I didn't take a picture of but it was a mix of solid and liquid, some white and brown. No blood. Today she is much the same. I was able to get to the feed store and got a salt block with selenium in it and dissolved some in water and pippetted that into her. I don't know any one else with chickens at all so I would be hesitant to think it was mareks. Attached a poorly recorded video from last night. Any ideas?