I used to have a problem with those little @&$holes. From what I understand, they aren't a danger to the plants. They CAN be a symptom that something is wrong in your media. I never tried controlling them chemically. Have you seen any flying about when you disturb the pots? If not, you could have a colony of springtails. I've had those as well. They will set up shop just about anywhere there is moisture.
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