Hola Amigo

ChAs420 nailed it, I see a lot of purple stems, I think its a hibred trait, if they turn purple in flower it could be a Mag deficency. 

https://www.growweedeasy.com/purple-stems-cannabis-seedling#:~:text=Magnesium%20deficiency%20can%20cause%20purple,Mag%20to%20your%20nutrient%20regimen.