Has anyone seen this before??

I'm following a standard nutrient schedule that i have been using all year....this is a pic of a white widdow.....why is it slightly curling at the tips? i'm pretty sure that i have enough magnesium....its also not hot on the leaves as leaves closer to the bottom are exhibiting this as well....these plants are in bloom....also, I have a diesel strain that is in with these girls and its not having this curling leaf problem.

that white widow seems to not like either the nute levels whats the ppm you are mixing? ph? and temp in the room?
I had something like this not as bad but I did a flush and remixed at a lower ppm. like you I had diferent types and
1 of the three didnt like it, anyways flush/lower nutes and check the ph in the run off

i forgot where i saw this but i did there a specific dignosis for leafs that fold up and fold down. https://www.rollitup.org/marijuana-plant-problems/216537-self-diagnose-your-plants.html

https://www.rollitup.org/indoor-growing/23962-leaves-folding-upwards-length-wise.html

thanks....i'll try a flush...temps are within norms....maybe white widow is sensetive to nutes

Has any one grow head band?

I'm about too.