1_DuB

Purpling is due to Mag deficiency. In your case there's too much light in your tent . Adding Cal-Mag won't solve your problem until you dim your light or put it further. Proper Mag def is rare, Mag def is mostly due to too much light or over watering (in media). In your case it can't be over watering of course, you're using Cal-Mag and still having purpling, the only last solution is your light, your light is too powerful for this size of plant. Your nootz solution is too hot by the way, you start to get nootz burn. What's the amount of ppm's in the res. ?