[Snowflake311]

That looks like 2 males fighting to me. They do that from
Time To time no ones gets hurt. They display like that to show off for females. That is not a mating dance. My galaxy danios spawn in my HC. The females are duller color and they shimmy side be side and kind of go around. Then they swimm close to each other with the male following the female close. They eat thier own fry and the eggs so unless you have a breeding tank set
Up don't expect many fry.

You have 2 males digging but don't worry it's normal.

 

[Snowflake311]

If they do, great, cause I'm OVERRUN. I started with 5 last year and have now given away 50+. I have a constant stair-step of fry in the tank. No breeding tank necessary IMO/E.

You must have a good size tanks for the them with lots of plants and few predators?

Because yes in the right tank they will produce like crazy but many of us don't have the perfect set up for fry survival. Also depending on the type of filters too. Filters kill fry.