I'm so sorry about Cheese
You didn't do anything wrong - the little chap was not growing properly, meaning that wasn't right from the start. It's terribly sad, but it's definitely not your fault.
QJ - are the eggs lying on their sides now? With those blue eggs, next time I'd wash half of them before incubation. That'll make them more porous and will aid in water loss. If you do half only you can compare the effect of washing versus not washing.

QJ - are the eggs lying on their sides now? With those blue eggs, next time I'd wash half of them before incubation. That'll make them more porous and will aid in water loss. If you do half only you can compare the effect of washing versus not washing.