Leaves Curling Up Nute Burn?

Hi,

I may have burnt this plant, leaves are curling up and dying I just want to find out what I did wrong for next time.

I know i over nutes, i have them full strenth nutes when it should have been much lower, but just to make sure does this look like nute burn or something else as well?

Using coco soiless and coco nf nutes.

well there is some nute burn in there but also looks like some heat stress.. that pic shows about 83 degrees but does it get much hotter in there? usually the tips curling in like that constitute heat stress

in fact it probably did get a little hot in there, was up to 90 degrees at one stage.. only for a short time but it generally never goes over 84 now

ya thats def. what caused the edges to curl... try to keep it around 80 at the max if at all possible... as far as the kid goes i would say to flush her out reaaaaly well and feed her with a weaker nute solution... should be good to go in no time