whats up,

I am have a huge problem with my plants and its getting worse. If somone could please help me with this one, iwould really appreciate it. Heres the problem, as you can see. The fan leaves on the plants are getting yellow and have these brown spots with curling at the tips..whats wrong and how do I fix it??

AGE:3.5 weeks

400w MH
Temp 78 degrees
Growing medium- rockwool in claypebbles (in hydro)
humitdy 38%
PH 6.3
Nutrients ( this may be the problem,) full dosage (the plant leaves were yellow so i went from half to full)
dougefresh Reviewed by dougefresh on . What Wrong with my leaves???? whats up, I am have a huge problem with my plants and its getting worse. If somone could please help me with this one, iwould really appreciate it. Heres the problem, as you can see. The fan leaves on the plants are getting yellow and have these brown spots with curling at the tips..whats wrong and how do I fix it?? AGE:3.5 weeks 400w MH Temp 78 degrees Growing medium- rockwool in claypebbles (in hydro) humitdy 38% Rating: 5