Noticed this today any ideas? 2 days shy of six weeks into flower and 9 weeks old
Last runoff was 6.1 that was Saturday and ppm of 1510
This may help?
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If it’s just your lower fan leaves I would say water damage.
Rusty spot color is it only on the oldest fan leaves?
Too much water? Or splash back?
@AAA
Splash back
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Magnesium?
It also looks N toxicity.
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Looks higher up then splash back.
I can’t remember, indoor or outdoor?
Maybe @Myfriendis410 or @WickedAle can help.
Indoor, with some humidity trouble.
@MattyBear just posted this on another thread.
“Do you have a fan blowing in there? The rust spots can form when there is a lack of airflow and your medium stays wet. It is also a common sign of calcium deficiency or telling you that the ph is not in optimal range.”
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@MattyBear I do have fans blowing but that one is kinda low compared to others so not so much movement with fan. Ph run off test was 6.1 last feeding 6.5 went in. I have to water today what should I set ph to in order to bring it back up
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Water won’t bring it up. Soil amendments do, and high TDS liquid (feeding) does as well. 6.1 is fine, frankly. I’d keep PH’ING as you are.
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What numbers am I wanting? I can feed I usually do every other
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1,000 to 1,200 ppm. Mid flower is your peak demand. Watch runoff numbers too.
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Ok thank you 
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@Myfriendis410 @AAA I fed at 700 ppm and 6.5 her runoff was ppm1640 5.9 ph uugghh looks like it’s getting worse. It looks much worse under the blurples
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It won’t let me post photo 