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I got brown spots/blotches from overwatering. I'm DWC but somehow pump never started up after nute change so they were in wet plugs with no O2 for a few hrs. same as overwatering. what ur res size and how many airstones u runnin? Im using 10 stones in 35 gallons of nutes.
same as karlee all 4 plants ive done so far have/had purple stems. my current is first from seed and human error from the get go has caused problems. advice from others here and the gwe diagnose your problem pics I had classic cal/mag deficiency. within 4 or 5 days of adding cal/mag shes doing great and no new brown spots. hope you get same results now that you've added same. good luck
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