Black mold on germinating medium!

I started some pepper seeds in coir medium on November 20. The medium is in multicell trays with clear plastic domes. I placed the trays on top of the refrigerator thinking the warmth would be a little higher than most areas of the house. I checked the trays today and noticed some cells are developing black mold on top of the coir. I don't think that will be good for the pepper plants when they germinate. Should I remove the domes and allow the medium to dry a little or should I somehow treat the mold? I've never had growing medium become moldy before but I've also never germinated under the domes before.

Thanks

Ted