Thats right.It depends on the strain how much stretch you will get. All strains are different.
around 700 ppm flora nova and voodoo juice , i burned then a Little b4 now I got it under control , i have 120 buckets with the lids from my massive prior grow I might just use them .. My flowering room its 12' high X 8 Lenght X 6 wide , how many buckets should I use 6 or 8 under one single 600 hps with ERA lumen's ? theres a pic of the buckets with the the bit lidsFLIP!! how much food are you giving them? It looks like your sativa dominant strains are getting overferted a bit. you may want to run less food to them and you should top them. if you get clones, great. if not, your at least controlling the canopy a bit. I would trip the bottoms off the indica/s. you need some cal-mg+ or epsom salts added to your res. I see the beginnings of a magnesium defic.