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im sorry, i just realized u said only 2 of 9 are having probs. are u sure they are getting enough oxygen. i used to run a DWC and i would always have my airstones slide to the edge of the system, and the center plants would suffer. usualy they would go yellow first due to overwatering (under oxygenating).
are they weaker plants compared to the rest?
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Quote:
"The only dead bodies from marijuana are in the prisons and at the hands of the police.
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