After posting pics the other day, I candled the good egg one more time. The top of the egg pushed in under the light. Turns out the top of the egg was a bit soft, and I didn’t catch it during the first Candling. Ugh. 
 
So.. I put wax on the part that broke. I don’t know how well the membranes survived. I’m thinking there are worse places for cracks, but it is still not good. It was the best embryo of the 3, so I’m just sick about it. Will see if it survived on day 18 next week. 
 
Any idea what would cause the top to be soft or thin? (Not sure which) I’ve never run into this before! I didn’t put anymore pressure on it than normal when candling.