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They kind of look like RAs by shape, and the fact that they're crawling on the roots. They're not the darker color I expect, though, and I can't identify the signature "dual tail pipes". These pictures are at 200x and 60x - They look like specks with the naked eye and slowly moving specks with a loupe. I am used to seeing RAs more easily without magnification. The roots where they're found are more brown than the others - though the medium is being reused and full of old roots - so it could possibly be already-dead rootmass attracting them.