i feel you dude, I don't let my roomie even touch the nutes cuz I know he wouldn't show the care and diligence. Now, i let him watch them grow. But shit what can a fella do when he can't do it himself. I am familiar with ph down, and that is some strong shit. I've had hella huge fight, almost blows over this shit with my roomie/best friend, its so LAME, we lived in the house together, but woudn't talk or anything, its really not worth it. I feel you on the not THINKING part. Maybe, next time, if there is one, write out some instructions. Thats what I am gonna do if i ever go on vac or out of town.

Best of luck with those plants dude. after the good flush, tomorrow they should look a LOT better than they do now.