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brown/reddish spots on some of the top leafs, what could this be?

Diips
Diipsstarted grow question 3 hours ago
ive spotted a few brown/reddish spots on some of the top leafs. what could this be? using biotabs starterpack.
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Week 8
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Lerome
Leromeanswered grow question 2 hours ago
It appears to be a calcium deficiency, which is common in BioBizz soils. The calcium is simply used up after a couple of weeks, even irrigating with tap water doesnt supply enough calcium often times. I suggest to water with CalMag from now on for the next weeks.
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