ok, so more fish mass=more water changes. What about instead of a community tank, It could be just one or two "feature fish" and then like 1 bottom dweller?
Yeah that could work, could include some other "dither fish" (smaller fish that swim around to help the larger fish feel comfortable) as well. If your water is neutral - to -hard, you could go with a male of an amatitlania species. They are a central American family, they all stay around 6" and under, and I have found that males tend to be extremely aggressive to other cichlids especially when breeding, but not so bad to things like swordtails, mollys, and plecos. Some good species would be A. Sajica, Honduran Red Point, A. cutteri, A. Myrnae
Here is my male P. Panamensis (similar to amatitlania) with community fish in a 45 gallon