Are we talkin soft and acidic or hard and alkaline? That makes a pretty big difference on what cichlids you can keep. If everything you have listed there is in one 72 gallon I'm really confused. I don't know how you keep chromides with rams cause they kinda sorta need totally different types of water. I guess if your doing it you must have everything parked at nutrual and everyone is adjusted. Anyway, apistos would be a good idea if your pH is low 7's or lower. All I can say though is get a couple of your own test kits or at least figure out what kind of water you got in there.