Weak leaf, curl down, but no insects and good humidity

by Robert
(Indonesia)


Hi there,

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?

Thank you

Robert

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