White Fuzz under Jiffy pot

I noticed a mildew smell while checking on my clones yesterday. I pulled the biodigradable pot out and there was whit fuzz under it. I took her away from the other plants and put her in the sun for now. Should I cull her, is she safe to put back or is there anything I should do to treat this?

Hydrogen Peroxicide if it is only in the pot 2 tsp a litre or mist straight with 3% put her in some fresh soil after and monitor others for same

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Lower humidity by 15 % or 20 might help also as well ?