A simpler way to see if you have mites is to take a sheet of white paper hold it flat under a fan leaf , Give a couple of sharp flicks of your finger to the leaf.
Suff will fall on the paper ,If you have mites you'll notice that some of those little specks on the sheet will start to move .
If you have acess to a hose they can be sprayed off.
Another way to control mites and aphids is to use citrus oil .
This is easy to make .get the peels from oranges ,grapefruit ,limes ,ect.
Boil a couple of quarts of water and steep the peels in the it .
Don't leave this tea over an open flame ,the oils are volital and you could blow your kitchen up.\
Then just spray this mixture on your plants twice a week for two weeks .
You break the life cycle of the bugs and the residual citrus oil acts as a repellent.
This tea method can also be done with tabbaco , Nicotine ( the active ingredient) is a poison .
Personally I don't use it
Preditors are a good idea ,but are much more effective used as a preventative measure.
Thhe best defense is offense.