There are not. There's the silver, the black, the asian (which is illegal in the US), and two australian species, one of which is the jardini and the other one is not in the trade at all it seems, and they all get at least 2 and half feet long which is well beyond the holding capacity of a 125g.
There are certain filter-feeding african arrowana species, but I don't know how big they get. And since they are passive filter-feeders, I don't think you'd be interested in them anyway. And on top of all that, you would have to shell out some heavy cash to get one shipped out to you.
Closest thing there is would be those surface-dwelling butterfly fish that most LFSes sell, that only reach about 5" in length and are consequently suitable for small tanks.