Little Neo bugs! What are they?

[Miss_Cat]

Hi Neo growers,
I've noticed that with each watering the tiniest, tiny little black bugs crawl out of my sphagnum Neo mounts. They end up crawling and jumping on my sink wall until I flush them down the drain.

I haven't noticed any apparent ill effects to my Neo plants other than they seem to be hiding in the moss and multiplying, and the fact that they eventually settle into nearby newly mounted plants after a few months.

Does anyone know what they are, if they are actually harmful, and how to keep them in check /or eliminate them in a non-chemical way?
(Sorry if this has been discussed already.)

Thanks!