Calcium/Potassium deficiency or light burn?

TheGreenGreek

Active Member
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.
 

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