yellow leaves

im lost does anyone know what this issue could be? I had transplanted the plant to a bigger pot 4 days ago. I just started seeing this three days ago and this morning it started curling up.

here a little about my setup.
Plants are strawberry cought, flour-scent lights " 2 48 inch 32w tubes " 2 1/2 weeks old, ph of 6.7, fox farm ocean forrest soil, no nutrition added yet since i transplanted them in a biger pot to with new soil....

Overwatering possibly...

i dont think it is overwatering cause the leaves are very dry on the edge. if you touch it starts to crack.

Nutrition burrrrrrn. Stop feeding them. They are way young. Some simple water till they are about a month old. Then go with the veg nutes.

hes not feeding them. maybe necrosis(sp) from Ph? OP, do you test your runoff PH?

are u using ro water

im using Reverse Osmosis water.... i havent tested the run off water yet.... i'll do it when i get of work.