They migt not be mites guys... they could be substrate mites.
What substrate do you use and is your snake bathing more than usual and are these black things actually on your snake? You normally tell the difference as the harmless ones will just crawl about the substrate and may end up in the water bowel as they like the moisture will snake mites will be actually on your snake and your snake will bathe to get them off.
They might not be mites guys... they could be substrate mites. I sometimes wonder how many snakes get bathed and put through stress over harmless wood bugs.
What substrate do you use and is your snake bathing more than usual and are these black things actually on your snake? You normally tell the difference as the harmless ones will just crawl about the substrate and may end up in the water bowel as they like the moisture will snake mites will be actually on your snake and your snake will bathe to get them off.