I'm having a issue with curling up leaves. Just the sides of new leves. They seem to wanish when they get older. But al new grow has the same problem.
I's a Jack Harrer in soil whith organic compost. 600w led light aprox 50cm distance.
Water ph between 6,5 and 6,8.
I use some fertilizer to from Remo.
Never hat thisi issue and I'm unable to find an anser.
Check for bugs and only fond a coupl os leave hopper wich were remooved.
If someone has a sugestion it would be greatly apresiated!
(Please vorgive my bad English!)

Light too close? Not enough moisture?

Others may have an answer

yup your burning them up, move light about 30in above & turn it down to about 50% until it heals, just my opinion...