burns on tips and edges

Grrrower
Grrrowerstarted grow question 6y ago
the large leaves seem to be fine, but the small ones between the internodes are developing several burns Soon I will proceed with the washing, but what could it have been?
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Week 4
Leaves. Edges burnt
Leaves. Tips - Burnt
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MadeInGermany
MadeInGermanyanswered grow question 6y ago
Don't worry ;-) looks great ;-) Assume a lot of food because it's so dark :-)
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Brewer1112
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Calcium deficiency?Calcium deficiency? It Was my first thought but as it progresses I'm not so sure
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