U got 2 males and a female rasbora......
2 jealous guys over a girl and that's what u get.

However if you introduce more rasboras, this behavior should be rectified.
The analogy I can give is in a bar with many guys and many beautiful girls..... boys behave themselves and even if they don't the fight isn't always between the 2 of them.

... time to go out and get more fish.... he he he