im guessing this is your 1st time growing and or posting on this forum
with little to no real information provided most people will say that a cal mag problem based on you saying you use ro water ( ro water should always have some cal mag added to it )
it be best for you to tell people what medium you use and if you are checking ph plus the amount of nutrients you add to your water and how often
you feed/water. temps humidity probably good to know but not so impotent if its growing outdoors . knowing that is more of a indoor thing
are they clones or from seed.
to me shiny dark green leaves means nitrogen toxicity not saying thats what is the problem
if you get your ph and feeding in check they will grow just fine as they do not look that bad especially if they are clones because leaves on clones often go funny for the 1st few weeks while roots grow
just wondering. if they are outdoors why are you taking them inside at night and putting them under a light to veg ???
i see no reason to be doing that or are you saying they came from a outdoor plant and you are growing indoors. if thats the cause i say cool go right ahead but watch out for bugs that might be on them. it sucks having your indoor room infested with gnats and other pests
i feel like most of the well know growers on here wont reply because of the lack of information or they just have lives
my outtake: ph your water to 6.4 ish never lower then 6 never higher then 6.8 and add about 0.9 ec of total nutrients to your water depending on what medium you use. water once a day also depending on pot size plus medium
if you dont understand ec and you use ppm tds i use this to help my self out but it might not me 100% correct
https://www.bluelab.com/knowledge-base-files/Conductivity-Conversion-Chart
