Share Your Clownfish Knowledge

[Pier Pressure]

I broke down and bought a pair of true percs (wild caught) last weekend. I thought they would host in my green bubble tip anemone but oh, no - they headed straight for the white sebae where they are still hanging out.

Questions: Are clownfish asexual? Can they change sexes? Who is bigger - the male or the female?

I will of course be researching online but this site is such a wealth of information and thought I would see what you guys had to say.

Thanks in advance for any replies!