Any advice would be great ty all!
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About 500ppm. Maybe I burned them? Hgdroton on top is dry. I just have bubbles hitting the bottom of the net pot and seems to be getting most of the hydroton beneath the surface level. I took better close ups.They look a bit light. What nutes and how many ppms are you running? The top of the hydroton looks slightly moist, if so lower your water level a couple inches