please help save me

ok guys heres a pic of a leaf on the plant hope its clear enough for you to help. thinking it might be mag or potassium def. please help.

ok sorry this might help. watering with ph adjusted water, nutes are technaflora bc grow, bloom,boost and the suggar daddy,magical,b1 green and red. last soil check was a low 5.6 waterted with 6.8 twice since then continues to get worse.

what is the ppm of the run off, i know techna is fishy about exactly how much your suppose to give them

the run off is a little high in the 7 ins. with the distilled water and the nutes ph comes to 6.8 just like they say. and i didnt go full strength unil the 3 rd feeding.

im sorry i was wrong its low in reds had it backwards .

I never go above 5.5/58 and my plants are always happy.have these plants ever been flused because if not i would recomend doing that has soon has possible.i used to have all the problems you are haveing now untill watching the greenhouse seed company grows they never go above 5.8.stick to a lower ph dude and flush the shit out of them they may have excess salt build up.

yeah i think salt buildup is the culprit of the issue with some of the plants only really three of them giving me problems. all the same bag strain must be sensitive to higher ph. ive been flushing for the last 2 waterings going to flush i more time and go back to quarter feed and start from there and watch new growth. any more ideas would be help ful.thanks