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Thanks for the reply.

Does anyone have any experience with this??? Hollow stems??? 1. Grown using aeroponics. 2. Different varieties all effected, at least 6 varieties. Blue Dream, GDP, Kosh Kush, Tora Bora, Blueberry. 3. Advanced Nutrients connoisseur PH perfect. 4. 1000 Ws. 5. CO2 @ 1500 PPM. 6. Temp in...

I have a home built aerogarden, and also used advanced nutrients. I had similar brown spots that developed into something worse. From what I've concluded, it is either a Calcium deficiency or nutrient lock out from salts. I've since been supplementing with Cal Mag but mine were too far along...