Praying for better

Growforsmok

New Member
Hi guys and girls.
I have a few plants growing inside a tent on my first floor:
3x Wedding cake
1x Og kush
1x uknown seed that I found in my drawer (from an earlier grow)
To the point:
On the Cakes only, I see some leaves with a brown edge. The new small leafsets that grow out will mostly not grow anywhere and will only turn dark and die. The Kush is going great like last time??!. This has been going in almost from seed.
I am really, really confused about this as I normally create very beautiful plants.
What is new in this grow is that I got myself an EC meter and spend a good time measuring and correcting with it. pH is always 5.8-6.0 and runoff is a little, not much, higher than what I pour in the coco.
Also I spend a good time pouring pH juize in the feeding mix and also mixing the fertilizer in the way the company shows on their video.
Fertilizer I use is Canna coco A+B (4.5ml each) and Rhizo (6mI). I use a 2l tank but am looking for a bigger tank for mixing maybe 10L.
The plants had a fine start I must say, problems first started to occur in the last two weeks. They are all~3 week from seed atm.
I would like someone to help me here?? Would appreciate alot.
Have a few grows indoor on hand so I’m not new to things, so don’t spare information please. Not saying im pro at all. But very confused grower. Hope to hear from some of you.
 

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Also, for information I grow under a 600w hps hanging 50-55cm over the canopy. I know it’s not the proper spectrum, so ordered a new ballast for my 400w MH which is on the way.
but still unsure what to point out as a main problem. Cheers
 
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