I found it yesterday when I was inspecting the unit when I got home. It seems to be some kind of fungal growth.
I cleared it out, but I’m wondering if it is because that grow tank has too much water flowing through it. I get that feeling from looking at them because one side looks dry on top while the other looks constantly wet. Take a look at this side by side comparison.
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There are certain root-stimulus powders that are also anti-fungal. There are plain anti-fungal additives as well, but the root stimulant might also help your cucumber vines.