Can someone tell me what is wrong?

Hello fellow growers. I am having a bit of an issue with my babies. Can’t seem to pinpoint the issue. My set up is a RDWC, water temps at 68F, pH at 5.9, PPM 430 General hydroponics Flora series on week 2 of veg, air temp in tent 73F. I have attached pics of my foliage and roots. Maybe some of you experienced DWC growers can help me identify the issue so I can correct it. Thanks on advanced.

The lights I am using are TimberGrow COBB 300watt, model 3VL 18-20 inches from top of plants

They look good what’s the matter? The set up is good as well

Looks good to me too.
Got a fan blowing on the plant?

Nothing wrong , water temperature ? Is it RDWC or just DWC? It looks healthy, dont panic

nute burn or maybe just water getting on leaves