Red stems deficiency or genetics?

[sourdieselyumyum]

Just wondering what u guys think they look healthy to me last watering was 730 ppm of just base cns17 grow looking to flip to 12/12 in 3 or 4 days

 

[goatlicker]

Just wondering what u guys think they look healthy to me last watering was 730 ppm of just base cns17 grow looking to flip to 12/12 in 3 or 4 days

My plants used to and still do this a tad during winter when its colder.. used to get round 15 Celsius and they would slowly turn purple.

 

[DemonTrich]

mine always do that. but I grow in a controlled temp environment. 75* lights on and 73* lights off year round.

 

[bf80255]

if you mean that bit of color on your fan leaves yeah thats genetic not an issue

 

[DemonTrich]

he is talking about the dark red stripe on his fan leaf stems. I get this on my main stalks as well.