Aeroflo problems, please help!

Hi!

My friend is having problems on his grow and i thought i'd ask you guys

First some info:

Week 2
Using AN nutes and following feed chart
pH 5.8
Water temperature 22 degrees celsius
1000w hps at 80cm from tops
Temps 25.5 and 41 humidity

Roots are white and clean and root mass growing nice but plants Look like these

Any idea what's wrong?

Thanks in advance!

The humidity is too low anyway. So that could be a reason.
Check a VPD chart.

Also (but that might have nothing to do with how they look now)... don't follow what AN says, but get a EC-meter.

To much light for the size of the plant. 250w is more than enough at that stage.

Too much light they are light saturated