I have recently started breeding my own Seramas, and I have found them to be very fragile. To be fair, I sit and stare at them in disbelief that anything that small CAN live! I've had a few that die suddenly, or that fail to thrive and "give up the ghost" after about a week. So far, I've had to hatch two to get one, but I'm getting better. The only reccommendations I can make are:
make sure they are warm enough, but give them somewhere they can go if they get too hot.
give them chopped game chick starter so they can eat it (I've read warnings about choking on larger pieces, but Idunno)
protect them from clumsy bigger chicks, who don't mean any harm, but can kill otherwise
Good luck!