Yellow/brown spots appearing on seedlings

[Ark2]

Hi all, 

 

First grow underway growing auto Blueberry and auto Dos Si Dos. 
 

Day 12 today and noticed both seedlings developing deficiencies in first set of true leaves…

 

Growing in Coco Coir.

18/6 light schedule 

Starting watering when medium started to dry out (ph’ed to 6.1) and started feeding 0.25ml of Calmag, general hydroponics trio per litre of water) every 2-3 days.  

 

breaking up waterings with normal ph’d water. 
 

any help would be great! 
 

Thankyou! 

Edited August 11, 2023 by Ark2

[mikeydoughnut]

Coco needs nutrients every feed bud.

[Lux_Interior]

Have you got any photos of the seedlings?

 

 

[Clubs]

@Ark2 16/7 light schedule  What happens during the other hour?

 

But really.  Give them at least 18hrs light, preferably 20 or even 24 if low temps become an issue.

Edited August 11, 2023 by Clubs
Spelling