[QUOTE=rainbowreptiles;1895008]Thanks to everyone for the replies. I think I will just keep incubating them until I'm sure they're not viable... but as of the end of the day today, I think they're pretty much toast.

However, I've looked online and haven't found an answer for this other question. Can eggs that look fertile go bad? Assuming there's no temp or humidity issues. Can an egg just fail to thrive for no apparent reason?[/QUOTE]

yes they can