Gmix said:

What medium are you using as the ph is at a hydro/coir lvl
It looks like soil which would suggest your ph is out of range.
However with all these new mediums & only getting a small view it’s best to ask.
I don’t know about your ec lvl as I grow organically.
It does look like your ph is out of range
You might get told to look for bugs if your ph isn’t the problem

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TimikaPerez said:

Since you’re in coco, your pH and EC actually sound pretty reasonable on paper, especially for a plant that age. If the curl is isolated to just one growth tip and the rest of the plant looks healthy, I honestly wouldn’t panic yet. Sometimes new growth can come out twisted or curled from minor environmental stress and then normalize a few days later.

A couple things I’d still check:
make sure runoff EC isn’t drifting upward over time from salt buildup, and inspect very closely for early pest signs, especially broad/russet mites since they can distort new growth before you see visible bugs. Also consider whether that one top is sitting in a slightly different microclimate under the light or airflow.

The recent DLI increase could also be contributing if the plant was already pushing hard growth. Some phenos react faster than others. Personally I’d hold conditions stable for a few days instead of chasing fixes immediately. If the next sets of leaves emerge normal, it was probably just temporary stress rather than a deficiency or disease issue.

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