kill em!
I think I'm just going to let the pots dry out a little extra long... it is quite apparent that they don't like to be exposed to air. Another thing I noticed is that they mostly seem to be under the pots in which I used Roots original. The other 30 plants were potted using Sunshine #4 advanced/ProMix BX. Not sure if this is coincidence or not.
So yeah, letting everything dry out as much as possible then think I will do a drench on the 3 plants where I've seen them in abundance. I'd hate to think I'm killing something that's not harming my plants, but I'd rather not risk it.
Oh yeah, nematodes and soil mites are supposed top be in healthy soil! Save the drenching for FGs! You'll just waste money and perhaps slow the growth by drenching w chems. Get those predatory nematodes!