Help identify, Clown fish swim motion.

[comets55]

Can anyone help me identify why my clown fishes are swimming up & down & up & down at the same spot (like surfing).

Why did they do that? Is this some sign of sick? Thanks.

 

[crister13]

They're called clownfish for a reason!!!! Lol they're fine.

 

[Schism]

Lol yep perfectly normal clowns. I find it entertaining.