:iagree: They will do much better in a larger group, the nipping and aggressiveness will be spread out throughout the school. Also they are very active and need room to swim - it's not really a bio-load issue but a space one. As for the eventual compatibility of Angels and barbs, I'm not sure as I haven't kept angels, but I've heard the barbs' nippiness is not good with the angel's long fins. But perhaps a large enough school would help this?