Epileptic clown?

[ok. so ive got two percs so far and they seem to be doing alright, but one of the two has an odd behavior.
it tremors slightly.
it happens every so often, with the frequency increasing during feeding time, or when the other (more agressive) perc bumps it with its nose.
so what is this? fish epilepsy? an odd mannerism? the result of one of a mated pair changing gender?
there are no other signs of sickness that my newbie eyes can see.
what do you guys think?]
 
[I read about it recently over on RC. It isn't a bad thing. I think it was something the male does, and usually before they lay eggs... but it could very well be a mannerism as well.

I wouldn't worry yet. Put away that crushed Prozac you've got there!! :p]
 
[My male Perc did this when I first put the pair in my tank! Though I have no eggs :( 5 months later both fish are doing well.]
 
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