Its definitely a barb...all of them aren't aggressive.
My first guess was Rosy barb, but after looking through some pictures, I'm not so sure. They could be female rosy barbs. Are they shiny looking?
They definitely look alot like those Red Glass Barbs. That is the closest I can get to an ID. The pictures of Rosy barbs and Gold barbs don't look as close as the Red Glass Barbs that LWB linked to.
Cherry barbs are another example of non-aggressive barbs. My 3 are harmless.