Dancing Danios

[Weeze]

I have two zebra danios and one leopard danio. They are always entertaining!
They never bother any of my other fish and are endlessly zipping around the tank chasing eachother. I have noticed them chasing eachother really fast and then just abruptly stopping anywhere in the tank and then circling eachother slowly nose to tail. (this is usually done in pairs) for a few seconds and then zipping off again. Looks very funny, wandering if it is some strange mating habit or aggression. Does anyone elses danios do this??

 

[paulioo]

Im pretty sure thats them deciding who's the boss.
They're great fish