Hennypenny-I'm sorry that happened to you. I don't know about the silkie embryo, but I left a silkie egg with bacterial growth in with my others because I could see a dark mass that wasn't moving much, but I still thought it might have been a chick- when I finally took it out- no movement or veining for a week, there was a hairline crack. The membrane inside was all swollen. It was probably about to explode, which could have jeopardized the other eggs- that would have been horrible. I almost didn't take it out because I was afraid there might be a late chick inside. I guess what I'm saying is, you can only do your best.