Pale & purple

[Nicodemus]

One of my lady is pale green and it's stems are purple in color... Isn't this the sign for nitrogen defiency? She's 4 weeks and 3 days old. Only given her water and some h2o2 and two times little of Root Juice. Growing in soil.
Before putting any ferts in to the feeding water they should be about 30-43 cm in height, right? The strain is California orange bud.

 

[RooRman]

Phosphorus: lack of causes stunted growth, purple stems, and pale colored leaves. When the soil PH goes above 6.8 plants cannot access Phosphorus.