Autopot mold on surface of promix hp

I was wondering if anyone has a solution to my problem. I am using promix hp with the autopot and there is mold growing on the surface of the promix. I am not sure how to fix and prevent this is the future.

You are good, no need to fix or prevent. Molds that grow in/on the soil generally do not affect living plants

Just mycos from the promix all good.

Thanks for your guys quick response. Was getting a little worried. Should have known it was Mycorrhizae since i was doing organic gardening with bokashi bran.