The mildew isn't really in the soil, but on the outside of the fabric pot. There is some green mold that forms at the very bottom after the water in the overflow container and I just wipe that up with some alcohol. I’m not too worried about it affecting my plants at all. There is plenty of airflow with my fans on the buds and the humidity doesn’t get too crazy. I’ve got fresh air being pumped into the grow room all day and night.
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Oh I see. 💪