Burnt leaves! Nutrient Burn?!

So I found this info and seems inline and makes sense. But are these desired ppm levels before feeding the plant or from the runoff

Those are what they are recommending for input. Notice the second bullet point. “Water with a ppm”

Thanks for your help. This is like raising a baby :joy:. I’m rlly trying to do this right on the first run.

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So I just started giving my plant nutrients again and I measured before:

6.79 ph
468 ppm

After (discarded the initial runoff and then measured):

5.98 ph

Not sure if my plant is just not taking in nutes or if there is just a buildup and it needs to be flushed. I poured a half gallon of Poland springs water in it now to hopefully wash them out. Anything else I should do?