Was there something unhealthy about the plant that made you examine it this closely? Almost everything has critters on it if you look close enough.

They could be mites, but mites can be beneficial or destructive or neutral depending on the species. Because of that, I'd suggest waiting for an ID or plant damage before doing something.

Yes, they are damaging the plant. You can see a little bit of one dead spot at the top of the video. I check all of my plants and they are bug-free.

Yeah, I'm thinking they're mites. I used tau-fluvalinate months ago which kills some mites but not these it seems. Or maybe I didn't use enough.

I found them on three other plants now. :-(

Do they have 8 legs?

I can't tell - I can't see any more detail than what's in that video. I'm away from home for a few days but when I go back I can try and see.

My guess would be the dreaded spider mite.

Pics from Google.

Is there webbing on your plants?

Yeah I saw those and they do look similar. But I was away from home for 3 months and someone else was taking care of my plants so they had plenty of time to multiply, yet there aren't that many of them. And no webbing. When I had them a long time ago there were never very many, and no webbing.