Leaves Curling Up - Taco

[mattie]

Hello From Holland!

Strain: CBD Kush (indica dominant)
1 Plant, indoor, small cabinet
Led 280Watts at 40cm above plant
temp daytime: 24 degrees
temp night: 18-19 degrees
Medium: Soil (canna bio plus)
Airpot 11 liters
Water: I use a tensiometer and keep it between 80 and 120 mbar
Nutrients: did not add any nutrients to the water. Soil is just one week old.

This is my first grow. I want to make a SCROG in small cabinet with just one plant.
Problem now: leaves are curling up. and also bottom of leaves are kind of purple
What could be causing this?

 

[Skullman420]

You didn't mention humidity levels. Are they very low?

 

[Chris Scorpio]

That's a bit close for a LED at that age, I'd back it off to 24"

 

[mattie]

You didn't mention humidity levels. Are they very low?

Sorry forgot. It is around 45%

That's a bit close for a LED at that age, I'd back it off to 24"

Ok thanks, will try that. Manufacturer advised 30-60 cm.

Wow you guys are quick to respond. That is awesome.
Maybe better if I don't post in Metric system? (celsius, centimeters...)

 

[Chris Scorpio]

30-60 depends on growth stage

24-30" for seedlings
12" ish for flowering

I do around 20-24" in veg stage


I'm just making the morning rounds and always like to help when I can my friend

 

[mattie]

Thanks for the advice!
Will do.
Should the existing leaves return to normal after adjusting heigth?
Or will only the new leaves do better?