Clownfish swimming weird

[Narain777]

Hi guys, my 2 year old clowfish has been swimming weirdly for the last few days. I'm really not sure what the problem is or if there is a problem at all..any of you guys have any guesses. Been in my tank for 2years and has been a real trooper through afew ich outbreaks. Still seems to be eating but just swims more vertically

 

[Soren]

Could it be due to the limited space in the acclimation box? Is there any way you could put the fish in a larger space for at least a short time to see if it swims in a different manner or continues the same way?
Is there sufficient oxygenation? Sometimes fish "breathe" at the surface if oxygen levels are too low. I'm guessing this is not the case from the appearance of the other occupants and the size of tank, but may be a possibility.

Clownfish are known to swim in strange manners, and the fin motion of yours seems somewhat normal to me, though I've never encountered the same situation.