I think you'd probably be ok with that setup. It is possible as Hound suggested that the rasbora's might stress the gourami (or a betta) in a 10 gal, especially when the rasbora's reach full size.
My suggestion. Start with the rasboras and a small clean up crew and see how you like it. You can decide later on if you think a "lazy" fish will be necessary. Raboras are active, but they aren't danios. What I mean is, they're active enough to be interesting, but not so active as to be "hectic". They can actually be relaxing to watch.
My suggestion. Start with the rasboras and a small clean up crew and see how you like it. You can decide later on if you think a "lazy" fish will be necessary. Raboras are active, but they aren't danios. What I mean is, they're active enough to be interesting, but not so active as to be "hectic". They can actually be relaxing to watch.