Plant problem? Brown spots on one leaf(pics)

thank you , i was trying to make it work my way at first and just wasnt working. once i got jungle juice it made a big difference and was alot easier to upkeep.
 
Update!: Shes been chopped, been a real fun grow, mistakes in the beginning made the success at the end much sweeter. Finally going to get to smoke some Cinex in 6 weeks. Been a long time comin :bigjoint::clap:
 
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