I'd ditch the seal a meal, it caused me the same issues early on last season and after I removed it and let the tubs breath my eggs did wonderful.
I know some people use seal a meal but I had bad results with it....
I use vermiculite below light diffuser and have 3 small holes in my 7qt locking lid tubs to allow ventilation and since I went to doing it this way have had no molding issues.
Sorry for the loss, hopefully you'll get the humidity issues worked out before your next eggies.
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