brown leaves??? how can me help

I do not see any bad leaves in that diary. This might have been an odd case where something spilled on them. but that bottom leaf looks like classic calmg issues. PH perfect lineup is good. but unless your using RO water dissolved minerals in your taps water can range and a PH meter is a smart thing to have aorund same with TDS Pen. You need to know the strength of the feed and how much to give them as not all plants feed the same. Blindly shooting in the dark. Give some calmg. But best to monitor your PH and EC/PPM regardless. Some of the early photos of your diary looked like they may have been getting over fed. Best of Luck and Happy Growing