Leaves starting too look bad

Hello peeps.. Started a grow with a slow start couse of Bad light but now they Are under led light, maby i need to repot? always use right ph and i tought i had bugs but checked all over with microscope and didnt see Any thing, i worry beacause of the White Marks / stretch Marks on the New Growth but No pests or bugs in sight..and also the New leaves after i topped is dropping straight Dow... H ope anyone can help

Hello
I reckon if your ph is fine, you're likely overfeeding.
The white shit on a couple of those leaves. Does it rub off? Or is it part of the symptoms?
If it rubs off. Don't touch anything and wash your hands. Id say its Powdery Mildew. If it is you'll need to treat it.
Getting it dry, is always a great start.
Comb your space over for bugs too.
Best wishes.
Good luck