@Fleetwood, Yes it is possible my last harvest of Bloody skunk its rest in 12/12 the last two weeks I had problem the heads became a little less compact but nothing serious.
@Blackrider, Mostly, thats my plan. I thought I would prune a bit and keep it on 18/6 until about week 8. Switch to 12/12 and start the fems flowering, and give the autos some darkness at the end of their cycle. It would only be a week or 2 of 12/12 for the autos
I had a plant (green crack also auto) grow very similar to your badbloody. It turned out fine, actually some of the tastiest bud I ever grew (could be coincidence)