Well It looks like it is just the 2 outta 12, I candled them last night on day 24 and I can see most reached the early stages of development, there are two that are solid black and feel heavier under the light and I quickly put them back and will give it another couple of days.
Is it wrong to be squeamish about cracking them open and having a look? My biggest worry is that I have let them down in some way, I really don't want to interfere with the process, but the two eggs that candled quite black have me a little sad, maybe they nearly made it, I will still give it through to day 26 before I stop.
The other two are bloody hilarious!
One question though, if I bring young chicks to the brood box will there be a bit of a hassle? These two square up to each other all the time, sticking their little chest out and flapping their 20c size wings, its funny but I see it is vaguely agressive?