First grow – Cotyledon undeveloped/yellow

 
 

Hi All, this is my first grow and I seek thy counsel.
I have a 3 week old youngin’ and her growth has stunted, one of the cotyledon leaves appears to be dying.

Setup Info:
indoor/soil
medium – coco coir (pre-soaked in water and micronutrient solution)
strain – Diesel Ryder from Joint Dr
water – local mineral (PH unkown)
watering frequency – every 2 days
light – cfl / sunlight (24hrs)
temperature – 20-25c
nutrients – applied for the first time this morning (NPK 8-3-4). 50% strength
humidity – unknown

symptoms:
The seedling was doing fine until wed/thurs when one of the cotyledon leaves started turning yellowish brown. The other cotyledon seems healthy.
The first two serrated leaves are visible but they haven’t grown in the last few days.

Possible causes:
the coco may have been too wet for a couple days. I dried it out last night to counter this, but I can’t really say anything has changed.

Nitrogen deficiency (the yellowing). I gave it fertilizer this morning (8-9 hours ago), but no response (yet).

I have attached 3 pics.
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Could I kindly ask one of you to share your thoughts.

Any help is highy appreciated.

Thanks everyone!:thankyou:
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