Like @Ynnead says, it sounds like pot worms (enchytraeids). I had them in my wormery. From my experience it’s best to get on top of them as soon as possible as it shows your wormery is too wet or acidic. My wormery worked really well for a couple of years and produced lovely compost but I started seeing tiny thread like white worms. I would then add lots of shredded cardboard or newspaper and it worked for a while but then I had an explosion of them and they took over and I started seeing less and less of the red worms. In the end it got to be a bit of a soggy mess so I abandoned the process! Hope you get rid of them 🤞
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I didn't succeed at first, but now I don't remember what I was doing wrong.