Spider Mites or Nutrient deficiency?

Outdoor grow on a rooftop
Planted June 5th
Plants are on a timed drip irrigation system(watered twice a day-early morning and late nite)
Potting Soil =fox farm ocean forest
Treated with general garden food once 5-10-5 about a month after planting
Also watered once with miracle grow
Added iron last night with water
Plants have been given no other nutrients

Green leaves develop spots the turn yellow, eventually you get curled up burned tips
leave dropping starts with fan leaves then moves upward.

"Treated with general garden food once 5-10-5 about a month after planting" Big No No....

"Also watered once with miracle grow" Not the best choice either....

But 100% thats not mites

That is a lack of nitrogen, get some veg food in her and the yellowing will cease...

mites-

and other crawlies aren't that hard to see. look carefully.

N def.

Definetly nitrogen def...u can see very light green leafs among the yellow