the hps light confuses the issue, but at least it could be excessive (N) causing twisting as this, on the extreme side as does TMV causes this twisting and stripping check here: Tobacco Mosaic Virus (TMV) Symptoms & Treatment on Cannabis good luck
Yes only at the top and at the spot right in the middle under a 600w HPS so yes most heat and light of all the plants in the tent right there!
Nitrogen excess is probably not the case as they haven't got much N since they entered flowering three weeks ago. TMV looks worringly similar though! When they were young seedlings, some of them had mottled leaves but without the twisting! Is TMV a rare condition?
its a killer and highly contagious, if you smoke cigs wash your hands before going near the plants the word is ..is popular in the us, most in the south, I'd just watch them close and see, by the mottling cheers
Leave that plant alone. Let it rip chip I cant emphasize enough that folks don't need to care for cannabis like a sick toddler lol That plant looks fine, lol no need to pull healthy fan leaves off
