Yesterday at the fish store, I got 2 rainbowfish. One is a boesemani and the other is a splendid rainbowfish. They are both still a little young, so their colors haven't really popped yet. I was a bit concerned getting just 2, and of different varieties, but they have paired up nicely and are even schooling (shoaling? ) with my rosy barbs!
I need a better digital camera, but these are OK pics...
Check out this link. It's got information on several different varieties. Their preference for high pH really suits this area! Mongabay Info on Rainbowfish