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i have had a simaler problem, my leafs also curled & yellowed im finding that i need to flush the roots weekly to avoid nuit lock up. my first grow was bad that was before i was told ablut nuit lock up . i have about 1300 ppm in my tank. i was told that any thing over 200 ppm the plants will not take up any more nuits above 200 ppm. i have ben flushing every 2 nuit changes with clearex and ro water , untill i get a reading under 200 ppm . usualy goes down to 150. then drain & replace with nuits.first pix is first grow with out flushin untill 6th week.the second pix, of the litle ones i have been flushing every 2 changes, the last pix is what thay looked like last friday. hope this info helps. good luck
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High Grade Connoisseur
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