This one has some breeding info.
Rosy Barb, Puntius (Barbus) conchonius Profile, with care, maintenance requirements and breeding information for your tropical fish
As I said, I've never bred them, but I can give you some very general info on breeding fish in general. It's best that they have their own tank, as these guys are egg scatterers and other fish will eat the eggs. High quality foods and big water changes have helped to get my fish "in the mood" in the past... the big water change replicates rainfall in the fishes' natural environment, which can often trigger a spawn.