Seedlings needs help!

[KingMarr]

I’ve got 5 six shooter auto and 1 smoothie auto, the smoothie is the larger one and has started to develop some brown spots on the leaves while the six shooters leaves are curling under and look like they’re developing the same spots.
Any ideas?

18L pots
Phlizon 2200w LED light
23-24C 55-65%
Coco coir

 

[dankstyle J]

2 me they look pretty good it's hard to tell what's really going on under that burple. It sounds like calcium an magnesium issue I hear led can cause a deficit of the 2 .

 

[Bigg Al]

Did you add cal/mag to your coco before you planted? I did 1 coco grow so far and I added cal/mag with every feeding.

 

[KingMarr]

I added A+B and rhizatonic before I planted but in the last feed I added some calmag. I’ve read that a waters PH needs to be at 6.5 for the plant to take up Calcium and magnesium? Any truth in that do you know?

 

[Bigg Al]

5.8 to 6.5 from what I researched.