nutrient burn! please help quick

four weeks of flowering and looks like i burned one. what do i do? flush? right now? or wait till moring when i usually water them? what exactly is flushing? vitamin b1 solution help it recover? about ten fan leaves burned up. im freakin out man!

Flushing is running a lot of water through your medium... if you have one gallon of dirt, run 4 gallons of water through there to flush.. Yes, it will be messy..

Straight water, 3 x your pot size.