I'm not necessarily worried about them, but I'd like to understand. They didn't look like worm cocoons when I looked up what those are supposed to look like. I guess they'd be maybe mites? But they look pretty big to be mite eggs. I can say they were growing in the one little space where there was no bedding. So it's something I think that likes to live on the surface or in dryer areas. There's a lot of mites in the bins. They showed up after I took a few handfuls of really dark soil I found at my neighbors horse farm. I hope they're not hurting the worms at all. I've had the worms about 2 months now. I can't tell if they're multiplying or not.