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I posted here a few days ago about yellow/brown tips. I was told she needed some nutes, which I did but it has since gotten worse. My ph meter needs calibration and the hydro store had no buffer solution. Could it be ph? nute lock out? or should I continue with just water? I don't think heat is...

Ah, thought it was probably that but wasn't sure. Very helpful chart, too. Thanks dude.

It's had the brown line on it since I got it, which I was thinking maybe a light touched it or something. But the tips are a bit yellow and there's a couple of brown dots on it. Any help would be appreciated.