I’m after some opinions before I take any actions. I’ve never used calmag before.
This morning the burnt one was praying leaves the other flat (& wind swept down) I planted 7 day old seedlings into 5 gal potting mix, peat based, dolomite lime, worm castings etc, I’ve used this mix for most of my historic grows. I’m back after two years off.
I planted before I got a blue lab by conductive pen, I don’t know how hot my soil was, it’s been 5wks. I started calmag because I was using distilled water, don’t have good record of my feeding, but I stopped feeding last week.
It’s affecting new growth, even new lateral growth on only one plant
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Looks like a magnesium deficiency Grow Bro, what’s your input and run off PH? 1/2 teaspoon of Epsom salts per gallon of water or feed is a great magnesium source 
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I would not rely on that soil probe. They are worthless.
Agree Mg def.
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Magnesium deficiency definitely, probable potassium deficiency too from the leaf edges. The inner margins are showing mag deficiency. Definitely need to check runoff numbers and adjust feed or correct ph or other causes of deficiencies. Possibly a bit overwatered too.
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Your PH is in range but the nutrient PPMs are low Growmie. Bump that up to 800-1000 PPMs on a 500 scale
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