Rust spot on leaves

This is my girl scout cookies. She is in pre flower and giving her 1.3 ec of nutes at around 5.8 ph. I am seeing a few leaves with slight rust spots on them. Most leaves look fine. Just raised ph to 6.1 to uptake more cal/mag

Another wierd issue is some of my leaves looked burnt but only on one side... very strange. Pics attached

Medium? How much cal mag are you giving? Looks like early potassium deficiency. Excess calcium a major cause.

Coco is the medium

Also giving a bit over 2ml a gallon of cal/mag in ro water

Beezelbuz said:

Also giving a bit over 2ml a gallon of cal/mag in ro water

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Put your cal mag in the water and measure EC.

Well cal,mag goes in after all other nutes but afterward ec is 1.7 which I water down to 1.3 for feed

Beezelbuz said:

Well cal,mag goes in after all other nutes but afterward ec is 1.7 which I water down to 1.3 for feed

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Kind of backwards. At least in my experience. However I'll repeat. Add just cal mag to the water and measure the EC.