First time grow question

A question from a fellow grower:

I followed the germination process and have my seeds now in soil covered
by dome for 2 days and noticed today a couple of cups starting to show
some mold on soil surface in solo cups. So I removed dome in hopes to dry
out area. Did I ruin anything or did I do the right thing by leaving dome
off.I do have 2 of 15 plants that popped out of soil. Hope that I didn’t
just waste 15 seeds.