I posted yesterday about a 1.5 week old chick that is obsessively pecking at the other chicks beaks. All the advise helped with possible causes. This isn't food or water aggression as she can be next to other chicks and eat and drink just fine. It also doesn't come across as establishing pecking order. She just walks around and pecks like they have something on their beaks that she is trying to get off. She also isn't picking on one in particular. She has done this to the point of bleeding on a couple though. I am confident that there are no other underlying reasons for this (temp good, brooder size good, multiple food and water stations)... All the other chicks have normal behavior. We have her separated in the brooder so she is near them and can see them, but she is still quite stressed by this. She peeps and jumps and scratches at the hardware cloth. I kept her separate for 12 hours, tried putting her in and she did it again. 12 more hours and I put a chick in with her. Ate and drank with it just fine, then while they were chilling she just starting picking at the other ones beak, not aggressively imo, more like obsessively. I can keep doing this for a while but I wonder at what point I am causing her too much stress and it would be better to cull her. Any thoughts?