CANNASIManswered grow question 7 years ago I personally do not like any kind of mold, in my top soil. I hard to ID the type and if is going to do good. I feed my plants a product packed of beneficial bacteria and a Trichoderma, that is a fungi it self, a benefitial "parasite" and controls fungal diseases, I suggest you have a look on it because it may regulate your soil and save many headaches...
Another tip as a natural fungicide is cinnamon powder, you just coat the top layer with it, also in this line of thinking you can make a spray and mist the soil. To make the spray stir some cinnamon into warm water and allow it to steep overnight, then you filter with a coffee filter. My use of this spray was limited.