Relax. These things are completely harmless.
The wee beasties appear to be springtails (Order Collembola). Springtails are detritivores, feeding on dead and decaying plant material, and will pose no harm to living plants. If any of them are still alive try nudging one with a small wire. It should jump. They have a structure folded under the abdomen that acts like a spring on a hair trigger and these little guys are world class jumpers. They're kind of fun to watch if you are into minute, six-legged acrobats. Eggs could have been in the roots of the plant or in the medium or a gravid female could have leaped over from another plant. They are common in most soils. Wood lice tend to be somewhat larger and have much longer antennae and are equally harmless to live plant material.
Dave C.
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