Clownfish shaking/wagging tail

[gabepowell101]

Is this normal? That muscle shell is the home for my clownfish pair.

 

[Crabs McJones]

Looks like a dominance display to me. perfectly normal :)

 

[Tahoe61]

Posturing, completely normal. The signs of submission will change as the clowns mature. There will be disputes over whose dominate. The larger female will assert dominance in more extreme ways, such as fin biting and chasing. As long as the smaller immature male responds accordingly the issue is typically resolved.