I spotted another bug yesterday, still not sure if it's a mite problem, though. I gave him another thorough search, but still turned up nothing in the usual spots. He's still not soaking. I'm wondering if they're just random bugs coming from the substrate. I'll just throw it out and give the tub a thorough cleaning this weekend. I'll use paper towels for now, until I can confidently say they're not mites. I'm going to pick up some Reptile Spray, as well.
Thanks for all of the suggestions, guys! I appreciate it.