hi i got 7 plants growing, they r 4 weeks old. 3 of them are doin really well the other 4 not so well. the stems are very thin do i need a fan in mty grow tent?
Is the soil draining ok? Try getting a small oscillating fan in there blowing on the plants back and forth simulating wind which will make the stems stronger. You will see the difference in a few days. Yellowing on the bottom leaves are you feeding yet?
The fan will not only help it's necessary for health plants the branches wont be able to support heavy buds if they are not thick enough. What size pots are they in?