Nutrirnt burn/deficiency?

Andes
Andesstarted grow question 6y ago
Pics attached show some sort of burn/rust. Can anyone advise what this is exactly? Did a bit of a flush with water and half strength calmag phd to 5.8
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Week 4
Feeding. Deficiences
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AmnZhz
AmnZhzanswered grow question 6y ago
Hi mate, first check you ph to be at right range, and secondly add cal mag (which I think is the problem)
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ThaKass
ThaKassanswered grow question 6y ago
Looks like some kind of bugs feeding on them, just my thoughts
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