I don't have soil mites. Only Microbial life found in a water solution. I check for beneficial bennies. I use Tea's making sure the soil is alive with them. My soil get's very dry before ea watering. Within 24 hrs they all need to be feed everyday. I use a lot of Air flow this also dry's out the soil. This is why I add coco to it..Not all the plants have these areas on the leaf. A few here and there. I'm always moving them around do to there height. I grow super lollipoped 6'+ tree's. These pictures are all from GG#4 leaves.