Discoloring

I put a ticket in but does anyone have any idea what this might be?

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Have you checked pH?

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Ph is at 6.33. Temp is 72, rh @ 50. Cleaned and double calibrated ph probe before the grow. Ph probe looks good and is not dirty. Roots look good.

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And all your nute lines are dispensing correctly?

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The only one that’s almost full is #1. I spoke with Danielle and they told me it was okay. She had a hard start and I almost had some damping off so the very first leaves that formed started rusting right away. She’s growing pretty fast. This is the first day of late veg. New growth looks good.

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