Strange looking marijuana problem

A question from a fellow grower:

Got a problem that has me stumped. Stunted new growth, with yellowing. Leaves look leathery. Growing in coco in root pouches. Get me pointed in the right direction!!

Let’s get you started with a support ticket, answer all the relevant questions and we might be able to get an idea of what is going on.

ILGM Support Tickett

What is the strain?
Indoor or Outdoor?
Size of space?
Soil or Hydro? Medium used?
PH?
Type of nutrients used? PPM levels?
Temperature?
Humidity %?
Light system/watts?
Vegetative Growth season or Bloom/Flower season? Number “weeks/days” from start of veg growth or into flowering?