I grow in rdwc and always get purple stems on my fresh clones for a couple weeks. After the first couple weeks everything comes in green but not till then. This last batch I put an extra one in coco and it has the same exact thing. The coco plant is outdoors in the bay area and the rdwc is indoors. It shouldn't be a temperature problem because they are 75 night and day. Nutrient solution stays at 70 with a chiller attached. I keep my ph between 5.8 and 6.0. I was thinking maybe there's something specific with either my nutrient numbers and hopefully someone on here can let me know. These are my current numbers. Is there something specific that I'm lacking that the girls need early in their lifes?