Clawing down leaf

Hi, if it's just before the night lamp periode it's normal, what is the soil setup ?

Long term over feeding.

Proper symptom of a Nitrogen excess during flowering

probably a high vpd... 45 is definitely low for that temp range. Yeah, that's going over 1.5-1.6 even if you are adjusting -4F for leaf temps. Important to remember VPD is calculated by leaf temps, not atmosphere temps. Leaf surface is cooler due to evaporation occuring. is this area also more impacted by fans/wind? could contribute. Plant is healthy throughout. Jus tmake sure it doesn't progressively get darker. As flower really kicks in, the plant doesn't need as much provided. Flower growth does need building blocks, but not at the same rate as vege growth, plus, it's stocked up lots of nutrition in those slightly dark leaves already. Might as well use it. May only need 80-85% of what you provided in vege phase based on overall concentration when a plant is well-fed up until that point, and proportionally less N is a big part of that but not all. I can tell by the lushness this is a well-fed plant context. Exact needs depend on all the choices made from day 1.. it's a cumulative effect. people that need to 'boost' and don't cause toxicities, probably don't feed as much early on. and those that cause significant toxicities lie to themselves that it's a positive effect, lol. Try what you want, but be honest about the results. If you do that, you'll find a happy zone no matter what. --- eliminating other possibilities More than one thing can cause this. If you irrigate properly, it's not a root issue, unelss you got some pest larvea chewing on the roots. That is usually quite apparent as you see the adult versions around too. Any gnats? and weird shit crawling on or under leaves? easy to rule out. too much light will all be located at the top, for one. other leaves are perky at the top, so i don't think this is the case. I don't see light inhibition behaviour, otherwise.

Sharp upturning of the very edges of the leaf margins supports the guess that the plant's leaves are losing moisture faster than the roots can replace it. This triggers crispy tips that go up and changes in gene expression to mitigate stress. It looks like windburn; windburn itself is the resulting damage, which doesn't always need to be visible to force a response. The plant responds to the stressor by altering its gene expression, which is why clawed leaves are randomly appearing across the tent. Too strong airflow for too long can eventually force a response of clawing, very similar to what I see here; it reshapes the leaf to be more aerodynamic to better deal with the stress of the airflow. 0.2m/s - 0.4m/s any stronger ambient airflow has a chance to stress the plant. . Reduce stress, it will stop new leaves but ones that are funky stay funky, they still work, just looks odd. Gluck.