`i have no clue whats going on !!! PLZ help

8 week old Gorilla Glue #4 plant leaves are curled upward. feel rough and stiff. also has purple stems and copper colored spots on leaves, ive been told its all due to the strain,,but i dont belive thats true from what ive read online,,but then again who knows,,also they tend to droop late in evening,,PLZ HELP IM AT A TOTAL LOSS,,ill add pictures here in just a few min
 
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