Just gonna put my 2 cents worth in here. I tried using those Jiffy flats with the clear plastic lid one time only...and my soil also got the fuzzy white looking stuff on there, so I've learned to never use it. It seems to just keep the soil too moist and that is asking for fungus or whatever that white stuff is.
I don't know how everybody else tarts their seeds, but here is what always works well for me. I use those round aluminum worklights (from Walmart) with plain old 60 watt bulbs, and clamp them onto the side of the top of a table...shine it on the seed flats WITHOUT the lid to keep the soil warm. Then I spritz the little Jiffy expandable peat pots 3 times a day with warm water to keep the starter soil moist so that the seeds will germinate, but it sort of dries a bit on top in between spritzings. Never had the fuzzy white soil problem again! And within 3-4 days, I have sprouted seedlings!
