I haven't had anything go bad with my ACC. I used a variety of nutes and lighting since they popped. I've used Iguana juice, GO Box nutes, HP2, Big Swell, molasses, Plant Amp by organi-grow which is a midwest-made nute, SuperThrive,basically a myriad of shit. I merely paid attention to my npk and adjusted them accordingly. I water or fed when the coco was too damn dry sometimes...my temps have been as high as 100+ degrees sometimes, pH and non-pH water, cfl's, 400 hps, I've never measured run off and all. . hell, I use a fish aquarium ph test kits..
and everything is nice. Since its my first time with AF's, I'm learning as I go but I'm def a convert now..One thing I've learned so far, its hella greasy...I'll try to post a pic tonight