Questions I would ask:

What type of lights are you using?
How high are the lights above the plant?
What is the temp/humidity in the space in which you are growing?
Are all the leaves like what you described or just a few?
What is the last thing that you did to your plant prior to noticing this issue?
MaryJayne420 Reviewed by MaryJayne420 on . NEW AT THIS NEED HELP.. MY plant has been getting yellow, the plains stems are purple, and there are brown spots, also the leaves are curling up.. please help. Rating: 5