Brown spots help me

He first started on the fan leaves. It started to spread rapidly. drain water ph 7 1900 pppm how can i save it

More information about your grow is required.

I don't know what day my plants are on. autoflowering. At first I thought I had a pH problem. When I measured my irrigation water with a pH meter, it showed pH 8. I adjusted my water to 6.5 with pH down solution. I started using amino cal mag after the 3rd week. I give pk13_14 to the plant that is in the flowering stage.Sorry for my English, I use translate. Thank you for your interest.

I started to see it in my new plant too. Everything starts like this.

I just started measuring pH

What is your medium, nutes, water source, feeding schedule, supplements, etc?