I've had a bit of a disastrous hatching year so far to be honest! First hatch was 8 chicken eggs in my brinsea mini eco, one chick hatched, 5 more were dead in shell. Then bought 6 duck eggs from south, half started but my husband knocked the inncy off the side... bought another 8 duck eggs from south, three hatched, one died within an hour... I've concluded that storing my incubator in the byre over winter wasn't the best thing for it, I don't think it's holding temp and humidity as it should.
I don't have fertile duck eggs but had a broody duck so gave her hens eggs - big mistake, there's a reason duck egg shells are tougher than hens! Managed to save a chick and pipped egg before she stood and smashed them all! Luckily had a broody hen who had same age eggs so she took the ducks. Whew! Better luck next time!