Thank you everyone for all of your help, the general consensus is that humidity was too high which I will have a play around with on my next batch. But how do I know which hygrometer to listen to!
@Wickedchicken6thank you so much, I have two seperate thermometers and a seperate hygrometer so temp and humidity should be accurate but I think humidity must just be too high
I've hatched about four batches of silkie eggs and everything dies at day 20! These are posted eggs from reknowned sources that I let set for a day before I put in incubator. I usually lose about 50% of them in the first 10
days and then the rest die at day 20. I incubate at 60% and 37.5 degrees...