IMO: That damage is from the outside in... not the inside out...
Something in your environment...
Splashed nutes/ferts on leaves...
Tips of plants 3-4-5 weeks ago too close to plant, tips and edges of plant burnt from you or your light or the nutes you watered with and splashed on plant...
That damage didn't happen over night...
That happened [3-5] 4 weeks ago...
The issue you have on your plant today is something you did 7 days ago or longer...
You hurt the leaves...
Carry on, feed and do everything as normal as you can...
Pay more attention to how you do stuff to your plant...
Be more easy around it...
exact, damage is usually from the out to the inside, but it can happen in the middle of a leave before its on the edges, and it doesnt always expand, somehow... and yeah i might have splashed some water + nutes on the leaves, but it seems a lot to me, didnt splash that much when i see how many have been damaged, and weird places too, canopy level... but thats when the distance from the leds might have been too close.
ok, thanx for the advices, i'll be more cautious when i feed them and hopefully that wont get worse. but i think my ph is way too high anyway, and i'll keep it at 6.5 max.
might it be harmful to feed them cal/mag on top of my usual routine?