HELP

woke up this morning to realize some something is wrong with a few leafs on 1 on my plants i need help to identify the problem and solve it asap. ill start by describing my setup, im using basic potting soil under 2x viparspectra tc600 in a 120/120 space using foxfarm nuts, temp is between 20-25c humidity is between 60-70% and lights are on 24-0, my feeding schedule for this plants didnt start till week 2. started with just blig bloom 4ml / gl but only had a ltr of the gl week 3 i got bit confused as to what i was doing on Sunday i gave 4ml calmag /gl then on Tues 3ml big bloom 3ml grow 2.5 ml cal mal then Thursday 2ml calmag then sat ph water only then monday 2ml call mag 3ml bigbloom 2 ml grow 1ml bloom then wendesday 2ml cal mg 4ml big bloom 2 ml grow then on Friday 2ml calmag 4 ml bigbloom 2ml grow today i planed on giving ph balanced water. there is only slight damage to the newer leaves and 1 more mature leaf some tips have yellowy browned and started to curl in purple steaks on stems few yellow spots and newer leafs are a bit light in color. all my water is between 6.3 6.7ph will up loads pics as soon as possible as have no camera just waiting for a friend to pop over with theres