clown trembles next to another clown?

[netopr]

Hi, I bought a 2.5" female false percula around 2 weeks ago. I already had a small 1" percula in there.
They are always swimming together, they dont separate at all..... Well the thing is that before I went to sleep, I saw the small percula trembling next to the body of the big clown.
Is something wrong with him ?

 

[jonthefishguy]

It is showing submissivness to the female. It is common and nothing to be worried about. The twitching is just a way of showing his way of knowing his place.