So i have this same type of damage for a few grows now and still cant be sure what is causing it, i have suspected either root aphids but i do use an ipm so the soil shouldnt be hospitable. Or root bound containers which i do have, i vegd them till i was sure the roots had grown throughout then transition them as i am under the influence they stop rooting much more during flowering and the damage normally starts when i turn the lights off. These are gdp and sc, about 4 mths old, 1st week of early flower going on second.
Turn the purple off and take a pic of the plant in regular white light as we can’t see anything.
Looks like nitrogen toxicity, what’s the run of PPMs and PH Growie 
Welcome to the community , support ticket would also be a big help.
I agree with @OGIncognito looks like shes clawing for nitrogen overload
Congrats again my Brother! Well done and deserved my friend 
Thanks @OGIncognito you da man!
right back at ya 
The clawing leaf is caused by whatever is turning my leaves that reddish brown in the middle but i dont think it is nitrogen toxicity, from the tests i have run it appears they are deficient even though i feed them twice a week at half strength, i had a nitrogen deficiency earlier this week, i also have two that had a nitrogen toxicity incident and they looked completely different with heavy leaf curl and blade constriction, the pictures with leaf curl down with no other damage is the bottom of the plant where most of my flowers on the bottom wilted and died like something sucked the life out of them but i cannot find any bugs. The big problems that cause the damage i worry about is the yellowing and ugly browning which curls the leaf up first then as the damage hits the tip it will curl downward, looking under the leaf looks like there are dark blotches that turn in to visible damage after and i always have magnesium deficiency symptoms regardless of how much i feed once i start flowering.
I try not to run my plants through till the end of flowering so i dont lose my predators but i test the ppm and ec of both my soil and solution so solution is 1.4 ec and ppm 1440 while soil is somehow 0.58 ec and 400ppm.
