Yes it is mites .
I don't know what you can get in Australia to kill the mites a lot of the sprays that will kill other pest won't kill them they are members of the spider family . I have used Safers insect soap on Phals . to kill them Neem might also work . Washing the leaves helps , they have a short hatch cycle think it is 3 days , what ever you use should be used every 3 days to get the new ones .
It sounds like the other pest is white fly.. miserable things they multiply fast also like dry conditions . Hope this helps a little