Clown is swimming almost vertical

[mengy007]

Is there something wrong with my clown? I introduced 2 clowns yesterday. The smaller of the 2 started swimming like this this morning. I had 2 damsels in the tank about a week now. I observed them all day yesterday and made sure they didn't fight. I have a 37 gallon with around 40lbs of live rock. The tank was cycled for around a month before adding fish. The 2 damsel and the bigger clown are fine.

Clown fish swimming funny
http://www.youtube.com/watch?v=njfidHM1o24

Here are all the fishes yesterday after I first introduced the clowns
http://www.youtube.com/watch?v=Y4XK9-E9a9w

 

[boxcar182]

your clown fish may have a disease that it got from a local fish store. damsels also get territorial and may have attacked it when you weren't watching it.

 

[toastedxb]

do a fresh water dip