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I am also co concerned about burned tips... I am adding 1/3 dose of what cal mag is asking on packaging....

Hey thanks guys... I'm growing in rockwool, with ph at 5.5. The run of on my EC is around 600 to 700 or less. I was leaning towards the calcium defficiantcy bit want to make an accurate conclusion with your help. The strain is Commerce city kush.

So starting to notice this on some lower leaves upper leaves around budd look better... Defficiant or beginning of root burn?