Nute burn

Hi all

Just noticed one of the lower fan leaves looking like this. Possible nute burn as I did uo the feed slightly on the last one a couple of days ago. Also noticed small shiny trails on some of the other plants in the greenhouse but non on the cannabis as of yet. Plants are growing really over the last 2 weeks and have no other problems as of yet
Thanks

I would ask to see the 'small shiny trails ' you found on some of the other plants as this may be the start of a thrips issue.. or maybe because I just dealt with a thrips issue I just have thrips on the brain..

edit: also a full plant pic would be good to include

Thanks
Il try and get a picture of it tomorrow. Here’s a pic of the full plant