Naughty Boy Boy Fish

Today I thought my small fish got baby for me.
But I waited for a long time also can't see any baby fish born.
But I saw the boy boy fish is very naughty.
In the video, you can see that the boy boy fish followed the girl girl fish's buttocks and sting on it, made the girl girl fish swim away.
When I took this video, I was listening music Don't Go Away-BY2.