You could try sprinkling a little cinnamon on the soil then water in. Just a couple of pinch fulls. Won't hurt your plants. Also good to avoid getting damping off of your seedlings.
I don't know man I don't wanna rag your nutrients or anything.. But this organic stuff everyone is using doesn't really seem that great.. I mean sure it's organic but that's doesn't mean Clean... I just had some Organic Big Bud go rotten on me as well as container of another organic nutrient and it's absolutely fucking disgusting.. I'm kind of done with organics.. Clean chemicals is the way to grow.. Cough Green Planet Nutrients..
Also just rough up the surface of the soil a day or two after each watering. That will keep the mold at bay. Make sure the top of soil is drying out in between waterings as well.
I'm very anxious guys.. I saw on the internet that could be great to add mycelium in the soil but I'm scared that this thing could be just a fvcking mold...