Good call on the danios needing more space than a 10 gallon, I wasn't thinking about how active they are, just that they stay smallish. Sorry about that freshie. As far as the barbs and the betta go, I've heard that keeping a betta in a community setting can go either way. Sometimes the other fish fin nip the betta, and sometimes the betta can misake other long finned fish for another betta and fight. But as long as you keep an eye on it I would think it would be ok, especially since it was MissFishy, who seems to know what she's talking about, that suggested it.