Update:

Both Bean and Bitey are still on paper towels, with glass water dish, and 2 hides only. Separated from snake room and each other

Bitey has a Dr appt on Nov 22nd, to recheck for mites, I'm going to do a second Frontline wipe down mid next week.

Now how do I know when all the mites are dead?? I haven't seen any on the paper towel substrate, none floating in the water dishes.

I purchased a lighted 20x magnifying glass to look at the snakes with and don't seen any bugs on them either.

Does this mean I have the situation handled? Or the little buggers are just hiding from me? Could the mite the vet found just have been a stray?

Being they went from the pet store to a split 20 gallon to separate 10 gallon tanks

Could they have had minimal mites on them to carry into the 10 gallon tanks?? and they have been eradicated??

I guess I'm just paranoid about an infestation getting out of control, but can't believe I haven't seen any at the same time.....