shaking 2 yr. perculas normal?

[1-9-06]

my percula clowns seem happy as normal but one or both always shake and wiggle next to anything (corals: mainly xenia and clams)alot. what are they doing? can clownfish have tourettes? are they exercising? cold and hungry? dancing?:wave:

 

[Gary Majchrzak]

it's the shimmy :dance:

 

[Slakker]

My Ocellaris do the same, it's a good sign that they're pairing up

 

[TikiDan]

Mine look like they are having seizures