My Grow Please Tips And Advise Welcome

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Howdy,

Noticed some purple and red colouring on some of your leaf stems...LED lights or low energy problem?
I get purpled stems without fail, although not in streaks or lines. I know that there is some discussion on what it means. Purpling has been blamed on everything from strain, cooler temps, nutrient, and light issues, although I have always noticed on the particular strain I grow (Sativa).
 
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