Brown spots and leaves curling up?

Brown spots with bottom leaves curling up.

DWC.

2nd Wk.
PPM-208
PH-6.0
Water temp-68
Tent temp-75

Auto flower

Using GH line
RO Water.

I have two plants growing in separate containers and both have identical symptoms. I didn’t splash nutes on them either.

Any help would be awesome.

it's normal to grow said:

Brown spots with bottom leaves curling up.

DWC.

2nd Wk.
PPM-208
PH-6.0
Water temp-68
Tent temp-75

Auto flower

Using GH line
RO Water.

I have two plants growing in separate containers and both have identical symptoms. I didn’t splash nutes on them either.

Any help would be awesome.

Click to expand...

Looks like nutrient deficiency. Follow the Plant Problem Guide below, to analyze, and correct the problem. There are tons of pictures, and I'm sure you'll come across something that looks like your's.
Plant Problem Guide

How are you watering them right now? Are you using drip emitters, or are you hand-watering? You want to make sure you're getting water to the roots, when they're that small. So, if you're not hand-watering, make sure your dripper is right next to the sprouts.

Hope that helps. Check back if you're still having problems.