Light yellowing of leaves from the edges and spots on another plant

Seriousblack

New Member
Week 3 hydroponic system
Ph 5.8
Ppm 1100
300 w hps lamp
 

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So I have the leaves have started to droop. Please let me know if I have done something wrong, I am really concerned
Week 4
Ppm : 600
pH : 5.9
Light 300 w LED
WHICH IS ABOUT 15 MINUTE INCHES FROM THE PLANT

I have reduced PPM because of the yellow spots on the leaves , I was at 1200 ppm initially in week 3 when I started noticing yellow spots. I was asked to drop the PPM and now I have.
 

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Water was almost half way through the net pot, now I she reduced water level to 1/2 inch below net pot. Temp is not more than 22-23 C
 
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