Clawing down leaf

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, and she returns to normal. Gluck.