We started incubating 6 call duck eggs on 12-23. One never developed the other 5 veined. Out of those there are 2 that have dark spots about half the size of a dime that seems to be staying in the same spot the last couple of times we candled and the air sack looks large and not shaped right. The other 3 you can see moving in the shells. Do you think the two with the dark spots are quitters and should we remove them at this point? Tried posting on incubation ahd hatching thread but got not answer. Thanks so much!