Some sort of mite? Suggestions for control?

[ceropegia]

As I was examining the mold growing on one of my pots (I'd allowed it to sit in a too-wet tray for too long...whoops) I noticed some miniscule yellow insects on the side of the pot. I think they are mites (they are about 1/4-1/2 of a mm) but I'm not sure what species. They don't look like spider mite pictures I've seen or anything...

I examined the plant itself and I didn't see any crawling on it, so at least that's a good sign. I checked all of my other pots and I found the same tiny yellow ones on 2 other pots, along with some longer-bodied black-striped insects (about the same size). All 3 of the pots were damp to the touch (I've not been too diligent with emptying their trays lately :/) but I didn't see any of them actually on the plants.

So are these mites? How do they spread exactly? I haven't seen much info on how they get from place to place. What should I do to get rid of them if they are harmful? I was thinking I might try neem oil since another plant of mine has mealybugs (I sequestered it in another room) but I'm not sure how effective it will be.

Any suggestions? I'm attaching a pic but it's pretty hard to see any detail. I circled some of them anyway. Thanks!