Sounds like a nitro deficiency, mine did that until I sprayed it with nitro rich plantfood.
Davinci420 Reviewed by Davinci420 on . 26 Days from seed.....but my worst fears.... These are my five plants at 26 days from seed. I used to have eight but my worst fears were realized when i went to check on them and at one site three of the five had been trampled by some sort of animal I am assuming. The other five plants i currently am growing are doing well. You can see that a couple are much larger than the others. But another is taking off now as well. Four plants are from high quality seeds (dont know what strain exactly), and one is from a bag of mids (the one Rating: 5