what is the diffrence between Ocellaris clownfish & percula clownfish?

are there any diffrences between these 2 clownfish??
and what clownfish is best for a nano aquarium??

 

Here's something that should clear it up for you a bit.

 

The major difference is the thickness of the black lines surrounding the white bars. Percs have thick black while ocellaris (false percs.) have very thin black lines. Also, ocellaris come in black variants from Darwin Australia, called black ocellaris or darwin ocellaris. Both get to be the same size and have the same tempermant, so pick which one you like best and go with it.