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Use distilled water + tap, not the bottled drinking water. Most brands of bottled drinking water have a whole lot of goodies within that can interfere with nutrient availablity. Brita filters can add sodium, so they should be avoided, too, although some people have used them and got great...

Umm, yeah, those lower leaves in the pic aren't the cotyledons. Those are fan leaves. This is a textbook example of a slight N deficiency.

Hi Brock It looks a lot like N deficiency, possibly magnesium lockout due to hard water too, which also mimics/triggers N deficiency. Either way, it's a mobile element deficiency, since the old leaves are the ones that are getting chewed up. This is easily remedied by a nice, thorough, heavy...

I am happy to hear another positive report. Looking forward to the update.

Welcome to Rollitup!

Yeppers. You'll get a bigger yield, too. Plants actually use more N than P even during flowering-- except the last two weeks.

I love DWC. Subbing.