Tiny white bugs in soil

[LydiasMom]

So, this morning I noticed tiny white bugs swarming a dead cricket in Lydia's old house, which has become her dining room, essentially. They're the shape of a grain of rice but incredibly smaller.

I use the e-coco substrate and there is local moss and chameleon plants growing in there.

Is there a way to tell what they are when they're too small for my eyes to see well? The soil in there isn't very damp anymore, so I'm thinking they aren't springtails, also they were all over that dead cricket. I haven't seen them in Lydia's main house, which has nice, moist soil. So I'm not crazy worried. But I'd like to know what they are. My other guess is newly hatched crickets, because she doesn't always eat all of them, so there's usually a couple continuing to live in there for a day or so, adult crickets that is.

Otherwise I'm assuming mites and if so do I need to worry about them bothering Lydia? She's an American toad, about 3inches long now.

*edit
P.S. I left that dead cricket for now because it's drawing them out of the soil where I can see them