Seedling and soil

If you growing in peat mold is common. You will want to mist just the top of the soil not the plant with some hydrogen peroxide. Then open the vent to max on any humidity dome. If it does not have a vent. Remove it. If you rooms humidity is low and the RH drops below 30%. Put a clean white yogourt container on top of it. but cut off its bottom. so all it is, is a plastic white tube surrounding the seedling. This will act as a humidly well. Once the plant gets bigger it will no longer need this and it can be removed. Watch how much your watering as well. molding indicates excess water as well. To much water will lead to mutated new gown or drown out the seed entirely. Water only when need, dry soil or droopy limp looking plants. Best of Luck and Happy Growing.