Heat stress?

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Problem: leaves curling inward

Medium/grow method: soil/perlite mix 65/35 (fox farm ocean forest)

Feed: and supplements used: dechlorinated tap water until day 10, AN sensi grow A+B & piranha at about 1 ml/l

water source: dechlorinated tap water

Strain/age: 00 Bubblegum 13 days

light used: 600w vipraspectra led

Climate: temp 73-76 f, humidity 40-50%

Additional info: I am almost positive this is heat stress, however after doing some more research it may be a humidity issue as I had a problem stabalizing my humidity for a couple days. Just want a confirmation or mrw diagnosis and if I should be worried later on. I have included some photos below. The bottom picture is her sister whom she shares a light with. Her sister is not reacting the same way.
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:toke:-- current T and RH% are fine,... that edge rolling can be caused by other things, but usually it a light/heat/transpiration stress thing... any bad combo of overly strong light (close proximity too), high heat, low RH, strong air movement can tip things off,... new growth looks good, so let's see what a few days brings,....
 
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