Only 1 plant in tent has curled edges and bent tips-darker green

Hey everyone, looking for ideas on what may be happening with 1 plant, the rest are all fine

The edges are curled up and some of the tips have bent down and it’s a darker green colour than the others

They are in floraflex pots, tested and all get the same level nutirents.

-Canna nutes into coco
-Mid weeks 5 (pk booster being added half strength and nutrients half strength)

I just added a third automatic feeding last week and I also added a fan that may be hitting this just a bit, although it is above it.

My lights (optic led slim 650s) are at 75% and were at 18” height, but I just raised them to 24” height this evening

Temps are 73 at day and 64 at night
Humidity is mid 50

I just got through first grow annd trimming and two of the plants had seeds, even though there were no signs of nanners or male part. I think I had lights was to close and (12”) and they were over fed and stressed

I’m trying to avoid this at all costs
I’ve included a pic
Thanks jeff

What strain? Looks like a purple punch plant.

Your temps don't sound high, too intense of lighting on some plants can cause the "taco leaf" as can too much airflow or heat. In this case, if its actually 73 day then I doubt its a heat issue.

I would say your right in thinking its the feed, I would mix your feed as usual and dilute by 10-20% with water for that particular plant and see if it resolves. Nitrogen Toxicity can cause a dark green foliage with downward curling leaves.