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it might even be a calcium deficiency. Very early and hard to tell. Ill take a picture tomrrow and hopefully someone can pinpoint.
Transpiration yes.... Transpiration PROBLEM. The plant won't die but it's definitely not ideal. Vpd is too high the plant is transpiring more than what the roots are accustomed to supplying so the plant is reducing the surface area of leaves excessively transpiring . You could lower temps ,raise humidity , reduce air movement and lower your ec to flatten the leaves back out. Like @hermit186 said it happens when the change occurs rapidly and the plant hasn't had time to adapt. A plant leaf in dry conditions develops a thicker cuticle to reduce water loss which takes some time. Look at the color of the newest growth when your lights first come on. Light green indicates moisture needs were met the previous day. Darker green indicates otherwise. I realize it had been answered a few times already just thought I'd throw in some extra info. Peace:)It's none of the above. It's just transpiration. They are growing fast and the plant is in overdrive. It will be ok. My plants do that all the time. It had me worried too at first but jib and Dr mcskunkins helped me straighten it out.