How did i get Hypoaspis miles out of the blue?

Upon tending to my tent plants I noticed the top of my coco was moving and found what I searched to be hypoaspis miles. After hearing they're beneficial and have seen no damage to my plant, my question is how did they appear? I'm using coco coir super soil with down to earth vegan mix and neem seed meal and inoculated with mycos from both a granular application and soaking of kelp/myco fertilizer. Has anyone else had these little critters appear out of nowhere as well? This is my first time experimenting with building an organic super soil and not used to seeing good fungi and such for indoor grows.

Spontaneous generation?

Hugo Phurst said:

Spontaneous generation?

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That's what I'm wondering, but just cant figure from where. I'm not complaining given seeing the price they run just to have to buy a colony of them. Just wondering if others had the same

I had em at my last spot, and was also not sure how I got em. I'm thinking they must come in coco somehow.