Marbanya

I have heard of people using a light mix of baking soda water sprayed on the mold sites. Just enough to upset the PH balance for the mold, but not strong enough to upset the PH of the plant. Those sprouts are pretty small, though, so if you try this, be careful and research more than just taking my word for it.

@Marbanya, I like keeping my soil alive, so I would do it even with coconut. As for pests, you could use at least a layer of rice hull. To keep a little moisture on top, and making a safe zone for the roots. It's sayd (broscience maybe), that you get around 30% more roots by doing that.

@Psilocubensis, You would do this with Coco Coir? I try not to add anything that might bring in disease or pests from outside. I also use cloth pots to keep the soil well drained. Coco Coir should be treated as Hydroponic in the sense that you are maintaining the nutrient balance and PPM ratios, testing the excess water/feed that flows through the cloth pots, into the tray.