the fish in with my mandarins are Amphiprion percula (Percula clownfish). They are the smallest growing of all the species of clownfish. However, although they are small, they can pack a punch and will not hesitate to attack fish twice their size if they invade their terrotory. I have seen Percula clownfish distroy Premnans (one of the largest and most agressive of the clownfish).
If you are after a species of clownfish that looks almost identical to the Perculas, but is much more easily going, is more availible, grows slightly larger and is relatively inexpensive, go for Oscillaris clowns (Amphiprion oscillaris)