this is week 7 since germinating seeds still running veg. I have had this happen multiple times through the grow. I am running a 70 gallon RDWC I am using cultured solutions and cal/mag. I keep the water around 5.9 +-.3 drift which is what they suggest. I use RO water and after nutrients I am around 290 ppm 500 scale currently, which I got after using the website nutrient calculator seen below and I use week 4. I was running off bottle recommended mix before this week and I would be around 740 ppm. In the photo you can see some bronzing on the leaf and the LED photo you can see the stem which is turning purple. The plants have thrived better this week with the low ppms so not sure what causes this.
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