Can anybody identify this problem?

I'm growing a lowrider autoflowering strain. Its under a 400w hps about 18 inches away from the plant, I'm using flower grow serious 10ml, 7.5ml, 2.5ml to thegallon in a 4 gallon tank with we other plants. I was thinking it could be nutrient burn because of the tips, but does the leaves yellow like that or is it natural? First time grower. Thank you for your input.

my lowrider plant

Leaves should not be yellowing,does not look like nute burn to me.

What is your Ph/ppm?

I haven't gotten a meter yet, could to high or to low ph do this?

The plant is not getting enough nutrients. Get something to check the ph(Power of Hydrogen). When using new rock be sure to wash all the loose sediment from it. The loose particles can effect the ph.

Ph is out, make sure its smack bang on 5.8.

^^^^^WRONG^^^^^ That would not cause that and are you telling me that your ph has to remain stable at 5.8 all the time? Fuck no, that bitch can drift to 7ish with no worries. All our plants would die if we didnt have constant ph monitoring if we had to run 5.8 all the time. Go make fun of some kids and quit giving advice cause it sucks.

I also noticed my leaves kind of curling in upward in a cupping form