sure you could start this now if you looking into 8 1/2 to 9 weeks of flowering... but i would rather go with signs of development of the buds check this excellent thread of video for this https://www.rollitup.org/newbie-central/7624-when-harvest.html and pay attention not just to the first pagethanx man,when do u think i should start running straight water ,their flowerin for 6 weeks 3 days now.any advice would be great.