I have a ball python that has been spending a lot of time in his water dish. I've read that this is a sign he has mites. I don't see any on him when I look, and there is something at the bottom of the water dish, but that looks more like the aspen bedding (I didn't get a good batch, it's super dusty and there are lots of little pieces). I'd feel better assuming he has mites and just treating it. Any suggestions for the best way to get rid of mites?

Many thanks!