Neons: Fighting, playing, or breeding?

[benny25]

I have recently moved my 5 neons to a new tank and they are now chasing each other back forth across the tank. They all got along fine before. There doesnt appear to be any physical damage on any of them but I'm worried. Any help is appreciated.

 

[IMCL85]

They just having fun. My cardinal and neon offen chase each other as well