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Do you have an ec/ppm pen? Testing the value of your nutrient mix can give us an idea if your over feeding. You can also test the runoff water to see if you have a buildup.
It seems to have started after addition of "chi ching" nutes . Coco loco medium. Similar thing happened last grow. I thought was light burn but raised them weeks ago & it's gets worse.
looks like light burn but could also be food related. Especially with a PH of 7 which is max for soil and to high for coco/hydro. Need more info to have a better guess.