Alright, a few questions!

A - I was reading about a cycle from the Marijuana Grower's Handbook and it recommends doing 24/24 the first week, and then gradually cutting an hour out until you get to 12/12 - this sounds awfully tempting.. should I even think about introducing this "lifestyle" to my plants?
(This is the 3rd day of their 18/6 cycle and they are 12 days old)

B - I read that the red stems may be a cause of Nitrogen and/or Potassium deficiency. I also heard some plants just have red stems and are completely healthy. Should I leave them be and just watch the leaves for any changes?

Thanks for the help!