What does this look like? Heat stress? Nutrient deficiency?

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hmmm hard to say mine did that and I cut back the nutes. Just for a minute to see the results. I also kept the temp ideal and just documented it. Try to do what you can and journal your results. Some of the others here can probably give you a more concise answer though. good luck. Mine snapped right back into shape after I decreased niutes.

from here it looks healthy.. when my leaves look nice and crisp like that, im a happy man. Lookin good man !

the plant is growing vigorously and i'm not overly concerned about the leaf curl... but, it's my first grow so every little thing makes me go "hmmm..."

yea i know how that can be.. i was so obsessed about being able to tell the female flower from the male flower.. thats all i researched for months. Then one day a male flower poped up.. and i finally Knew what was up..
hehe good times.

yeah nutes. that happened to me.

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mine are doing the exact same thing, but out of 12 plants in my ebb and flow tray, only the 4 plants that were closest to the bulb look like that. But mine are only 2 weeks old and on a 15% nute solution. It has to have something to do with the heat or light intensity, because all 12 get the same nutes. I'll get some pics in a min.

since those leaves curled up before showing signs of burns it is to 85% heat stress causing this, not nutes.

to make sure pass some facts about your grow:
-temps low/high
-lights
-pH of all liquids going in (and maybe even out if hydro)
-relative moister level

additional would be from value
-age
-nutes if you use by now
-grow medium
-if you grow in pots/how those compartments are made
-watering

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keep the thumb green and the gun oiled, !

As promised: The first three pictures are of the curling plants, as I said before, the plants in question were on the "bulb side" of the reflector... receiving.. I would imagine, slightly more heat then the rest of the plants. The 4th pic shows two plants, the right one with curling leaves, and the left one in perfect health..getting the exact same nute solution. The last one is an out of focus shot of the entire tray, just to help judge relative distance..but the light was about 6 inches lower until I moved it an hour ago, in an effort to correct the curling.

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i see crinkled Mylar at your grows walls, let me guess where a good part of your plants heat stress originates from...

on way to avoid this:
-Mylar only FLAT to the wall
-fan running at all times
-proper ventilation of an enclosed grow area
-proper monitoring of temps and humidity!

__________________
keep the thumb green and the gun oiled, !