Potassium deficiency or nute burn?

Just curious, but is your res live or sterile? I shit you not, when I was reading through, I recognized that damage as I went through that when I first started with an aeroponic setup. At that time, I was a big fan of HygroHybrid on YouTube, and mimicked his sterile approach, but I lacked a chiller so I marginally increased the H2O2 content to hopefully compensate for the warm water. Root slime, buggers everywhere. The roots looked like lo mein. Thankfully the donor plant later turned out to be male.

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