Sorry I forget you're soiless. Yah
@xenon730 is right about that. Even if you aren't organic neem or karanja oil is the best IPM. Contains 200 different natural limoids that all just absolutely destroy mites. It prevents molting, reproduction and pretty much having any instincts to live at all. It also causes them to vomit profusely.
I use a tsp of
neem oil, 1/4 tsp of aloe powder and
protekt as an emulsifier. I put this in a quart of warm water. Shake the hell out of it and shake every once and a while during application to keep the oil suspended. Not to be used on flowers. The plant can absorb the oil systemically and it lasts about 2 weeks.
Don't go cheap. The nature's choice is garbage and even bonide. Get
dynagro or neem resource.
The neem tree comes from india. People would wonder why all the crops would get eaten by locusts but they didn't touch the neem tree. It has been used for over a century.