What's happening with my leaves?!

[Cookiemonster69]

Hi everyone, I planted 10 gelato #41 from growers choice.

It's almost 3 week veg at the moment.
All apart from THIS one plant are growing beautiful lucious large green leaves. This on on the other hand is being very iffy. At first it was growing light green, then turning yellowy green.

My ppm rof feed is around 800ppm and pH between 5.6-6.3. watering everyday on Coco... What's going on?

Any remedies?

 

[Mañ'O'Green]

@Cookiemonster69 Most likely too much fertilizer. Some basic coco questions: Was the coco washed and pre-charged? Are you fertigating to 15% - 20% run-off every day that you fertigate?

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: PH in the root zone. How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics! Turn off the grow lights.

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(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

PH in the root zone:

Strain/age:

light used:

Climate:

Additional info: