So grow family im back again, and need help!

My girls stem are turning red or like a purplish color…i know im hurting them in some way… Can somebody help.

The most common reasons for red or purple stems are genetics, temperature fluctuations, light intensity, and stress. When red or purple stems are due to genetics, the plant will otherwise perform and appear healthy

Thanks bro @Mrb53004 …ill keep yu updated on them…they right now 34 days old n its blue widow and san fernado valley. And these are my grow ever.