Are you looking for a group for a specific size tank?
Roselines are very nice schooling fish. I'll try to post pics if I can get them to hold still
Guessing you're suggesting Praecox Rainbows? If so, I just so happen to have a couple pictures to share, taken of my newly acquired fish a couple days ago.
{Pics}
They're not constantly swimming that tightly together, but then I don't really have anything in the tank large enough to present a "threat" to them. They do seem to stick together a good bit of the time though, and are a lot of fun to watch. They're very active, and really color up once they're more comfortable with their environment.
had 300 in a 60 gallon they spent all day doing laps around the tank.