I was always under the impression that the two types of cichlids could not be mixed, due to water conditions and the ph thing. I run my african cichlid tank on the lower end of the ph scale for africans and they are all fine and healthy. I was doing some reading on americans lately, and most require a ph between 6.5 and 8. Some american cichlids seem to require a bit more "meaty" foods in their diet, but besides that, the diets do not seem a whole lot different. So why is it so "taboo" to mix the two?