Do you know why this happens? I have noticed the same thing in my hatches, it's very frustrating. My problem is more towards hatch day. They are fully developed, ready to come out, but they never internally pip. 90% of my deaths are like that, it's usually anywhere from 1/4 to an 1/8 of the eggs. If I could fix this problem my hatch rate could be nearly 100 every time.
What a sweet boy! I'm so sorry for your loss! His cute little pictures will be missed. Good luck with the egg though! Wouldn't that be wonderful?
Do you (or anyone else here) know anything about lacing as a gene? I wonder if it would be easier or more difficult if you crossed the seabright with a serama who already has lacing?
I don't know anything about it, but am definitely curious =)