yellow and curls help

[Muenster710]

Can anyone tell me if this is from heat or a nute deficiency its got yellow spots and curled upward leaves idk im brand new just did my first reservoir change and my ph was 6.0 one plants ppm is 1112 and the others is 860 in week 2 I just backed the led light off a bit to see if that helps

 

[ellz]

After looking at the last two pics, it might be nutrient burn after all.