The other approach is to get species that aren't common. The various forms of tiger barbs are kept by a lot of people, but there are other species that are more unusual, not so nippy, and don't get too big. You seldom hear of people with big schools of checkerboard barbs, and they're often seen in stores. Lots of interesting barbs, and rasboras you don't see everyday.
Likewise with tetras- neons have to be the one species everyone has. If you've got the right conditions, pencilfish can be spectacular.
So- for unusual fish-
For the top level of the tank- Copella arnoldi the splashing tetra:
http://www.aqua-fish.net/show.php?what=fish&cur_lang=2&id=370
Or there are many species of killifish that would also work. If you add some floating plants you may find fry eventually. Epiplatys, Aphyosemion, Fundulopanchax, Rivulus, etc. Just do the research on the individual species to see if it will work.
Lower level:
If the banjo doesn't get too big, you could get a big school of dwarf corydoras, like hastatus or pygmaeus. Or any unusual corydoras, aspidoras, etc.
Or on the other end, a small school of Dianema urostriatum would be very interesting. They wouldn't bother the smaller fish and you could see them from a distance. The contrast in size would make the tank more interesting.
http://filaman.ifm-geomar.de/Summary/SpeciesSummary.php?id=12204
Some rams, N anomala, or H thomasi would also liven up the lower level and add a lot of interest.
Likewise with tetras- neons have to be the one species everyone has. If you've got the right conditions, pencilfish can be spectacular.
So- for unusual fish-
For the top level of the tank- Copella arnoldi the splashing tetra:
http://www.aqua-fish.net/show.php?what=fish&cur_lang=2&id=370
Or there are many species of killifish that would also work. If you add some floating plants you may find fry eventually. Epiplatys, Aphyosemion, Fundulopanchax, Rivulus, etc. Just do the research on the individual species to see if it will work.
Lower level:
If the banjo doesn't get too big, you could get a big school of dwarf corydoras, like hastatus or pygmaeus. Or any unusual corydoras, aspidoras, etc.
Or on the other end, a small school of Dianema urostriatum would be very interesting. They wouldn't bother the smaller fish and you could see them from a distance. The contrast in size would make the tank more interesting.
http://filaman.ifm-geomar.de/Summary/SpeciesSummary.php?id=12204
Some rams, N anomala, or H thomasi would also liven up the lower level and add a lot of interest.