Cause of yellowing leaves?

Ak96

Active Member
Yellowing leaves have affected both of my plants at the base. A couple of the yellow leaves have brown spots. Anyone know the culprit?

-LEFT PLANT:
(9L pot - Westland Potting Soil)
Auto pink kush, week 6 (flowering week 2)
Had nitrogen toxicity previously but I believe it has since been cured.
-RIGHT PLANT:
(5L pot - Miracle Gro Potting Soil)
Auto Alaskan Purple, week 7 (flowering week 3)

I water roughly every 2 days and add nutes every 2nd water (so nutes are added every 4 days roughly)
I’m adding Biobizz’s biogrow and biobloom as my nutes.

specs:
MarsHydro 300w LED
2 oscillating fans, 1 exhaust, passive intake.

Humidity: 36%
Temp: 24 degrees celsius
 

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