Weak leaf, curl down, but no insects and good humidity
I am planting hydroponic lettuce (lolorosa and butterhead). Already 2weeks ending. PPM 720 PH 6.1 . Humidity 70% above. Currently is wet season here in Indonesia, Jakarta.
I noticed these 3 days back that the butterhead leaf are kinda look weak, curl down. I found no insects whatsoever.
I suspect there's defects in my nutrients. I sourced them locally here.
Am I right? If so, which element did I need to improve? If not, what could be the cause?
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