Too fast, too high

//MOST IMPORTANT, i see u have a lot of space left -lst (read about scrog, make net like this or use some soft strings to do it), then supercropping. -don't remove blue light, this causes plant stretching (wait until buds will stop growing up, then switch to red light) -make sure plant have a lot of air movement (when stem trembles from the wind [slightly!], plant must focus on building a stronger stem) -high difference between day and night temperature causes the plants to stretch -temp above 27-29C will also causes stretching -make sure your lamp are in good distance -if u think that canopy will get too dense start defoliating (be careful, but even if u hurt them i think this is better then light burn)

Do some defoliation and put a ScrOG on it! don't cut the main, you'll loose lots at this stage. Or you can try an extreme LST manoeuvre to pull the main a side.

You can try some Defoliation. When you remove leaves from your marijuana plant, you are taking away energy it put into vegetative growth. This will cause your marijuana to slow down growing, especially if you remove a lot of leaves. In the vegetative stage it is used to control the growth and structure of your plant. Basically leaves removed from any “branch” during the vegetative stage causes that branch to grow more slowly. Supercropping is also a great idea. you can also lst it down which will also help make a few more tops. Hope these suggestions are helpful. Happy Growing! 👊