Hey B420 . . . . .
The tiny little white dots do look like mite damage, there could be multiple infestations, (60+ different mites exist) agree with all of the above as far as destruction. A well diluted Pyrethrum product works well too.
Good luck . . . . . KILL EM ALL buddy!!!
Note, if you let the medium dry out enough so you can lift it easily, sort a garbage bin out and dunk the entire plant swishing it around in what ever product you decide on
. . . . . I had to do it with a big pot. I lined the soil with plastic, sprayed expanding foam over the top, and ten mins later had a hard surface so I could turn it upside down easy enough . . . . . peel off the foam after, obviously, lol.
~_