I put electrolyte as you told me and I decreased the temperature
the dead ones didn't have pasty gutt
and I think you are right I don't have to be worried about the sneezing as long as there is no discharge
But the poop is not normal is either brown or yellow diaherra sometimes watery is that...
I have 150 baby chicks age = 5 days
I managed the temperature and the ventilation for them
otherwise they have a foamy yellow poop some times brown , sneezing without nasal discharge , some chicks raising their heads and opening their mouse and some
of them has their poop stick to their tail...