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Can anyone help me diagnose this?

Hi guys,
I have some weird brown spots on some of my leafs on 1 or 2 plants out of 12. so i cant figure out what it could be, if they all had it ok but why only 2 to 3 plants showing this?
also what the heck is this ?
RDWC setup with ec of 1.7 ph 5.9 water temp 63 and using Southern AG
IMG_20200221_101814.jpgIMG_20200221_101922.jpgIMG_20200221_102053.jpg


February 21, 2020 at 07:42PM

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