I experimented with diatomaceous earth a few years ago with some WC Wall Lizards I collected. They had mites & I've heard of it being used to treat mites for plants. I mixed some in the potting soil I put them on instead of paper towel. Within a month to a month and a half they mites were gone. The first group I treated I then later moved to a non diatomaceous substrate. The second group I left then on it. Same thing; month or so later, no mites but I kept them on it. They all died right around the 6th month mark. I repeated it a 3rd time to see if it was a fluke or a result of the diatomaceous earth and same thing happened. My theory is that they might if either ingested or inhaled the diatomaceous earth. And it caused internal damage. If you look at it under a microscope its very gagged and cuts apart the mites as they try to eat it. Never did a full autopsy to confirm tho.