You won't find spider mites OR beneficial predatory mites in your worm bin. The beneficials predate on spider mites, which will only be found on green plants. You have some sort of worm bin mite, about which know pretty much nothing. BUT with one click into Google using 'worm bin mites', I found you a bunch of articles to read. Click on google images first to see the duplicate of your picture. Which was excellent, by the way. By the way, there are many, many species of mites and they are found in all kinds of habitats. Each tend to be very habitat specific, meaning that you can often come pretty close to identifying them by observing where they reside. Here is a link that might be useful: Worm Bin Mites

"I have noticed little clumps of webs. Not spun from leaf to leaf but more like set up as little houses on the under sides of the leaves. I have noticed that one of the plants the leaves feel very dry, not dead, just dry, and have yellowish patches on them. Is this spider mites? There are some little holes on the leaves as well." Sounds like classic spider mite sign. If you can see the webbing, you have a large amount of spider mites, and they are moving to the next plant! Take the plant AWAY from any other plant, and treat those plants as if they are infected even if you didn't see any visible sign. This is the organic way- Clip off the branches with the webbing, toss in a sealed bag into your trash. Wash each remaining leaf and stem by hand with a bit of soap and lots of water. I'd pour slightly soapy water into the pot, too, for good measure. Keep quarantined from other plants, and I'd spray leaves with soapy water every other day for a week, then every few days for another week. Or you can use neem oil instead, but it has a rather offensive odor inside. Good luck!

Hey guys. After zooming in on that first picture I'm thinking its roots. But any other ideas would be welcome. I've never really dealt with any infestation. I live on a 3rd floor so maybe that is too high for these little bugs to reach.

Susanne - Do the leaves look like this? The brown speck is dirt. I noticed that a few of the leaves have a light white dusting. Not sure if it's just dust or something else. I also noticed this morning that there were spider webs. The last several months I've had problems with house spiders so initially I thought it was just my usual spider problem, but now I am wondering if it's a case of spider mites. Here are photos of the webs on the key lime. I've been having problems with the key lime plants. The lemons are fine, but I'm not sure if it's because they are are so much larger than the key limes.