Dude.
you need to keep your fan runnning 24/7, same goes for your carbon filter. your temps should be no higher than 90F under light and about 75F in dark period. The pics look like pH damage, keep your pH at around 6, no lower than 5.9 and no higher than 6.3 and ensure you dont over-water 'em or add to much nutes to your water. you should also be looking for arond 55%-60% humidity until the last 2 weeks of flowering then bring temp down to 75-80F and humidity down as low as possible.