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Small yellow spots on leaves... deficiency or bugs?

Hello Growbuddy friends, I could use some help with this...

I have yellow spots on some leaves and I can figure out what it could be. (see pictures)

I've been looking aroung on the net but haven't found any good answers so I thought I would upload a few pictures here and see what you great people think.

Any input wouldbe appriciated....TY.

1.2M X 1.2M Grow tent, with intake fan and extraction fan. (+ 2 fans to move the air)

Strain: Critical Kush (Day 19 of Flower)

Medium; Soil (11 L. pots)

Temp (high/low) ; 29C / 22C

Humid (high/Low) ; 62% / 49% 

Water PH ; 6.1

PPM ; 160 (w/o Nutes) - 600 (w/nutes)

 

Any input would be appriciated....CHEERS.

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Small yellow spots on leaves... deficiency or bugs?

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