What is my fish doing?

As he is swimming around his head keeps twitching side to side. I don't think its uncontrollable, because he stopped doing it to eat. please help, its scaring me D:

Here's a video link to see what he's doing: http://s1120.photobucket.com/albums/l498/doghana/?action=view&current=24012011.mp4

He's a paradise fish, similar to siamese fighting fish. His name is admiral gilbert. He has had plenty to eat, the water is clean and de-chlorinated, room temperature, but its really freaky.
 
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