She's just buzzing along. I'm sure those are natural purple tones unless it's a sign of the reservoir being cold at night. After this week, I will refresh which is easier with this new Mars dwc bucket kit. In my home made last dwc, I caused major damages to my root system when refreshing my reservoir. With that problem solved it should be significantly less root stress. She ended the week at 4 inches.
I am going to use Mars Hydro's dwc bucket kit for this run. My first run with my homemade dwc had a few flaws that this system basically corrects. Systems great just be sure to set up your buckets before adding the rocks. I can't select my nute line but it's there behind the lines working to supplement plant health.