Is there any way to get rid of these?
 

I think they may be oribatid mites. I tried re-mossing and treating the plant/roots but they're just back again.

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Pretty sure thats a springtail! Harmless and perhaps beneficial, though they can be a sign that the media is breaking down.

Springtails! New medium, just remossed. Thanks for the ID, springtails at least *sounds* better than mites.