One egg I was going to toss on day 23 and when I picked it up I heard peeping. It had pipped the bottom side of the egg. I chipped some of the shell away and moistened the membrane and put it back into the hatcher and it hatched.
I have the same problem i have only one egg left in hincubator it passed the floating and candle test when i put it in the water it was floating and rolling giving signs of life but it's been 26 days and nothing i don't know what to do