Depends on tank size and species. There are 3 species that are considered 5 star generals; fasciatus, frempongi and elongatus. By far, the most aggressive and largest is fasciatus. I would not recommend this species if you are planning on keeping multiple individuals. The other 2 species are substantially more mellow and might tolerate the presence of other pairs, given a large enough tank. They also would probably tolerate large dithers in the form of african characins or similar fast moving, active fish. Catfish species such as synodontis might also be good tank mates.
Another thing to note is that these fish are monogamous spawners meaning they pair up and defend the nest and fry together. There is no need to have multiple females for each male. In fact, often times, there is little size difference between the sexes and females can kill males just as easily as males can kill females. Even sexing mature individuals can be difficult.
H. frempongi is endemic to one lake which would make for a very restrictive biotope. H. elongatus however, has a huge distribution, and would give you a lot of options when it comes to other species. H. elongatus usually maxes out around 5 or 6 inches too, which makes housing them a lot easier. I would think something like a 6 foot 180 would allow enough of room for a small group of elongatus and some other non cichlid tank mates.
