Mold question

My plants are at five weeks and there is white mold growing on the soil but only at the drainage holes. I'm sure this is a humidity issue and I've taken steps to corect it, but what can I do to kill off this mold? I noticed the mold when I was watering this morning so the mold is wet and you can't see it, I'll post pics tomorrow. Any help would be greatly appriciated.

Clear the mold
get humidity in check with the dehumidifier

Also add a small fan on low to keep air circulating around the pots and lower branches

keep fan on 24/7 to make sure air circulates as it is key to keep mold and bud rot in check when your humidity is high