Not sure if its anything to worry about but I have a two week old Alien Tahoe with purple stems and margins. It may be genetic but I'm just double checking. Using tap water in bush Alaska that is really clean. PH is 7.1 and 14 ppm from the tap. 1 nute feeding so far with a ppm of 250 and a pH of 6.6 to offset pH swing between watering. Plant is below 2 mars hydro 300w. Sent from my Three_Proofings_W9 using Grasscity Forum mobile app