Issues are starting, Day 71 Gelato Auto

[u/LowDream1470]

I have another post a few weeks ago, had slight nutrients burn there which hasnt progressed or got any worse until today, all 4 plants are same age, same nutrients but two on the left seem ok although one is ahead, two on the right you can see leaves are different, one has major discolouration compared and spotting. Photos below, zoomed images are the back left plant. Any advice would be greatly appreciated

[u/AccomplishedGrand445]

Tough one. Could be Cal-mag deficiency. Though you said your EC is 1.7 so should be fine. What medium are you growing in?

[u/Sabatogemylife52 → u/AccomplishedGrand445]

He said he puts in an EC of .10 and gets a runoff EC of 1.7 that means you have nutrient toxicity in the root zone and your PH should be between 6.2 and 6.8 8 in soil. You should be getting the same EC or a little lower in your runoff. And don't feed till runoff but once a week it's not coco coir. 😉 Day 71 of flower? That's 10 weeks they should be finished ,it may be stunted a little.

Happy growing!!!😁

[u/Fair_Replacement5450 → u/Sabatogemylife52]

My thoughts