WTF? Is this Nute burn?

These are 4 week old plants that just rapidely developed this problem. Everything was going good until this. The bottom leaves are effected. I'm running a DWC with an ultrasonic fogger that has been on 24/7. My PPM are about 525. PH 6.1. I'm using organic Botanicare Pro grow. Any ideas? How do I fix?

looks like nute burn. Use pure water for the next couple feedings. Watch for the burn to stop spreading upwards. Plants dont need much fert in soil.

Thanks for the tip. Have flushed and things are looking better.

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https://www.rollitup.org/marijuana-plant-problems/51407-what-causing-these-spots.html

https://www.rollitup.org/marijuana-plant-problems/52081-brown-spots-magnesium-deficiency-fungus.html

for a DWC at 4 weeks nutes sound a little high PH too. Lower nutes to about 400-450ppm and PH between 5.6-6 looks like mine does, either PH fluctuation or an MN Defficiency.GROWFAQ

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Thank you friend for that useful info.

no problem