More tiger barbs before you add other fish, they need to be kept in groups of at least 6 to minimise aggression on other fish. They should not be kept with long finned fish like male bettas or angels.
foxslilvixen - Ummmmm did you mean dyed/injected fish by "coloured glass fish"?? Do you know about dyeing?
I wouldn't ever buy those but you could have something like rainbow fish in there, maybe some kind of gourami would be good (not kissing, they get too big), some tetra perhaps. Kribs would also be nice, which may breed if you wanted.