something is killing my fan leaves

My fan leaves are being afflicted with some sort of something.... It started at the bottom of the plant and is working its way up, the leaves yellow like N def. and the outer edges of the leaves turn tan when dead and happen about the first half of the leaf. I am positive its not nutrient deficiency I use spikes and dressings and compost tea, ph is spot on at 6.5-7 I water right before they droop and the only thing I can find are the little "soil mites", thousands of them on top, I recycle the soil and have never had this problem before, Im running clones I cannot find enough info about the mites, whether beneficial or not, they are not springtails, they dont jump when watered, WTF is happening to my plants?

wow man thats pretty hectic sounds like a pain in the ass. Got any pics? Not a zinc def?

Not zinc, that starts at the top of the plant, this started at the bottom and worked its way up, my P uptake is all good, no purple leaf stems and I have huge microherds, I guess I might just dump this batch of soil( about 100gal) and lose all the work it takes to build that much TLO soil

Mn is important in keeping plants green, check your soil and nutes labels to make sure its in there.

each pot has 6tbsp greensand, about 9tbsp kelp meal, and 3 cups worth of composted cow manure at the bottom 1/3, around 3.5tbsp of dolomite lime throughout, Im not sure, thanks for the replies everyone, still researching, If I find anything I'll defiantly share the info!!!

Click on my ww and BB grow in my sig on the last page i put an update does your problem look the same as mine??