Beginning of heat stress?

Hi everyone. Both my plants seem too look like the beginning of leaf taco-in.

Am I right?

Lighting is Mars Hydro TS 600 and was at 18in. I just moved it to 20in from canopy.

temp is 75

humidity 50-60

Tried my best with the pictures. But you can see the leaves kinda folding upwards.

thanks in advance Guys