Not mites.
Looks like wet feet from the two decent pics.
Their roots may need some air.
I'd let the pots get light before watering again.

When you can water again, do so with Plain PH adjusted water.
Then check the PH of the run-off water.
Then amend without feeding and let the pots get light again before feeding.

Should fix it.

Disclaimer:
This is a general guess, based on poor photos and almost NO information.
If you want an answer with more confidence, you'll have to put in the effort and fill out the troubleshooting form.

http://boards.cannabis.com/plant-pro...anted-one.html.

Aloha,
Weezard