I had one go bad last year in a cluster of 7 about two weeks in. After a ton of research I did the do nothing method as Deb said, all remaining eggs went full term without any mold spreading and all hatched healthy babies. I remember reading that healthy eggs have a natural resistance to mold and the ones that mold are typically dead already or have something wrong with them. The healthy eggs don't normally mold even with a moldy egg right up on them and from my experience this proved true.
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