Did you keep the "goop" with the seeds? I think that gives the fungus something to eat.
And I agree: after 8 days, take them out and dry them. You don't want them to sprout.
Congratulations on saving seeds! So many small seed companies are being bought up that the few big companies at the top are approaching a monopoly. And heirlooms don't make them money, so they drop them. If there were no private seed savers, those big companies would soon have a monopoly over FOOD.
So kind of our government to protect us, the people, from big campaign contributors!