About a month ago, I posted about a chick that suddenly could not walk and flopped around. Some helpful folks and research convinced us that is was vitamin deficiency. However after giving it polyvisol (w/o iron) and vitamin E with selenium, it hasn't really improved. It actually has begun to go cross beaked and its growth may be stunted.Now to make it worse, this week we found that one of its half sisters can't walk either. Both chicks share the same father, a silkie, and have sebrite mothers. Is this something genetic or a disease? The chicks are about six or seven weeks old as of right now. We don't want to have to cull them but we're not so sure that they're going to get better. Any suggestions? Anyone have something similar to this?