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I did have a slight pH fluctuation about a week ago. But since then everything has been kept at a steady 6.0. After changing the res. the roots look good, slight brown staining from the nutrients, but deff not root rot. It only appears in a couple of places. And it looks like every place that...

Is this nutrient burn? After reading a bunch of threads I am pretty sure this is nutrient burn as it appeared after changing the reservoir. But it doesn't look exactly like the other pics. Can someone shed some light on this?