sorry if i am stating the obvious. i am just getting over what i thought was broad mites. i was using synthetic nutrients and was not checking my ph like i should. when i checked the ph of my nutrient solution, it was around 5! yikes. i changed to organic nutes a few waterings ago and i am already seeing healthy growth. ph will lock out nutrients which is maybe why the epsom salt spray helped. it bypassed the roots. good luck