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I've had brown rust problems in the early days when I was in hydro, but that was because I couldn't control the pH and it was swinging madly (rhizo, airstones, silt) - so pH can totally do that to your plants.
At the moment they're all looking much healthier and it hasn't spread, so perhaps it was a pH problem. Weird, but am happy....
At the moment they're all looking much healthier and it hasn't spread, so perhaps it was a pH problem. Weird, but am happy....