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Please help me. Two of my four plants have a problem they are in 25 litre bubblers, all linked with solution pumped through. Same conditions for all plants EC: 1.0 max, average 0.8 PH: Max 7.8 breifly, 4.6 breifly ave 5.8 End of 3rd week flower tomorrow. Browning of the leaves, between the...