I have had millipedes for a number of years,include them in my education program, and have one currently.please, NEVER EVER TRY TO GET RID OF THE MITES. The reason being is 1. the "treament" you are using to kill the mites could harm your millipede, 2. the mites are commensal...which means they are not harming your pet, but HELPING...they may look disgusting, but those mites are actually a millipedes own "clean-up crew". And do not worry about your other pets as well.....they cannot be transmitted because these mites are species-specific to your pet. Yes, they are literally "crawling" with the little buggers....but like everyone said, they are harmless to your pet, and the millipede needs them. Plus, I heard that it is useless trying to even remove them with tweezers, cause they just "come back".Hope this helps. If you have any questions, you can PM if ya like..
..this was taken of my own "Onyx", female giant black millipede.