Brown leaves in middle of plant

Troubleshooting
1

Trying to figure out why all of a sudden some fan leaves are turning brown. Using ffof soil, 4 weeks old GDP, feeding fox farm. It’s. In 3rd collum. Light at 18" feed only when soil is dry a few inches down.

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pH is at 6.5 in and 6.3 out. Ppm is 570 in and 1700 out. I know that is a little high but soil is new and hasn’t calmed down yet. Light 18 hours on. 7 gallon pot .
Last watering was gallon and a half.
Temp 78 and rh 65 par is 20.6
Any ideas guys and gals?

2

Water only 'til you hit 1,000 ppm runoff. Looks like a C def. You can add cal mag with water until your TDS is in it’s happy place, then resume feeding.

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