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what are u phing down your water to?

whats the res temp? i usually keep nutes around 400 ppm until it grows more shoots.. I top out around 7-800 ppm for veg 1000 for flowering.

It's happening on the older/lower fan leaves. Working its way up maybe a build up of calcium on the roots or something causing a lockout?

just pulled up the roots they are not slimy or weak, they feel solid and they are milky white. A couple days ago i added another 2 teaspoons of cal/mag to all of them. 3/4 started to grow more and slowed down on necrosis but one still is stunted (back left pot). Maybe calcium lockout? Too much...

WHAT IS WRONG!!!? using Ionic nutes tap water cal/mag- 3ml per gal set at 900 ppm ph 5.7-6.2 600 watt mh 2-3 ft above room is 75 degrees water temp around 70-72