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I am trying to address this issues my plants are having. I thought the spots were due to light burn but listening to the opinions of others, I flushed with 1.5 gallons of RO water with a pH of 6.5. I tested the runoff and discovered the pH of the runoff was at 5.2. I added cal mag to 1.5 gallons of RO water and raised the pH to 7.5. I used this to finish flushing. I also added a little garden lime. This I don't think will have much of an affect as it takes so long to adjust the soil. I will keep
Its nutrient related mate more than likely a few deficiencies mainly P+K but also likely calcium as well
check ph is on point and give her a complete feed with NPK and all the micro nutrients as well
Looks like she is wanting phosphorus and potassium . If it was a water issue the leaves would be a lot droopier. I think you went too long before providing feed or enough . Vegging npk ratio is 3-1-2.