looks like yellow in the leaves...i heard that could be...burning from you lighting, or if you had to transplant it recently it could be in shock, or malnutrients. i am sure someone that knows more can help you out or go to GrowFAQs

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Important: Everything i do or say on this site is complete fiction and is made up by me and only me. I have never tried pot and never will and i would especially never even consider growing it