Red jewels would probably be a good choice if you liked them. Another one that would be interesting for you guys would be Tropheus Duboisi Maswa, I'm not sure if you can get them over there, They are a small fish growing to only around 12cm, Should be kept in gropus of atleast 15 but I have kept them happily with 3 or 4 in a 2ft tank. I think if you are new to the hobby which you seem to be (no offence), then they would be a good choice, they are not the easiest fish to keep but are a very interesting one. Mine are fairly interactive with me. I started with 3 and that 3 has turnt into 28 of them. They are a vey addictive fish. :p