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hydroponic Help Needed: Hydroponic growing pepper - close up leaves

Hi, I am new to hydroponics and need advices.

IMG_20200508_101932.jpg


My Red Peter plant's leaves are closing up like in the photo.
New stems are kinda stunted.
Roots are healthy white and nice.
It is on DWC bucket.
No insects were observed.

Two days ago I decided to renew nutrients (ph 5.8 1300ppm, I administered KOH to ph 6.3)

This morning was ph 5.8, 1500ppm.
(maybe the nutrient mix had ph buffer so ph returned to 5.8)
I decided to dilute nutrient with more water, final measure ph 5.7 1000ppm.

Several days ago, the leaves turned upside down.

It gets hot yellow sunlight for about 2 hours.
And the rest is bright cloudy sunlight.

Can you help with my problem?
Thanks in advance.
 
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