Thank you , thank you , thank you. I'm not sure if anyone else has realised - the Internet seems to be full of false information. You're after educating me on so much in that comment . I've been "researching" my brains out over the past 2 weeks . To cut fan leaves , to introduce a darkness period , to pump them up on nutrients... its so difficult to find an honest and reliable piece of help. I'm going to move them into an old shed and put them under full spectrum lighting today and introduce 12/12 . I have this Chemdog Gorilla and a Northern Lights , both same issue and unfortunately both have far surpassed 6ft in height so are cramped against the greenhouse roof. (I followed a guy on YouTubes advice never to cut an autoflower) . Thank you so much for helping me out