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Is this a problem? Rust mold?
Aqueminianswered grow question 3 years ago
Its just starting so don't worry to much. Its either potassium deficiency or cal-mag deficiency. I'd start with cal-mag as it's much harder to over feed cal-mag. If it's a potassium deficiency you'll know because it will get bad over a few days but it's easy to fix and takes only a few days to stop symptoms.
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