Newbie Ailing Plant Question

seattlewa420

New Member
Hi there! First grow here and all of my plants are doing great except for one and I treat them all the same so I'm a bit confused by this. Anyway, one of them has brown/purple areas forming on the leaves. I imagine this could be due to nutrient deficiencies but I'm doing hydro and all the plants share the same solution. My pH is just fine. Temperature is also fine (to my knowledge). Any ideas out there?

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