I found a home for the 5 silver dollars and now my Frontosa is content! I was just too crowded and lively with them in the tank. They totally irritated her because they move quickly and constantly. Anyway, I still feel she needs to be with other fontosa's in a colony in a tank JUST for fronts.
But I'm curious... WHY would she not be able to maintain a healthy life in a tank with South American Cichlids? I feed her special foods just for her.