One can see adult mites easily with naked eye (I guess it depends on the eyes though). Young ones, well also with some difficulty, but you need to know exactly what you are looking for.
To have such bad deficiency in actual soil is really hard, not sure what to say, I'm fairly certain it's not the common two spotted mite though, at least not the main culprit.
What has happened between the point when the plants looked good till now?
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