Hi,
First - it's CLOWN fish (not crown). (That might make it easier for you to do a google search).
This is what I've found, though I can't vouch for the accuracy as I am only repeating what I've read:
- true percula usually has a lower height dorsal fin than the ocellaris (false perc) and one or two more dorsal fin spines.
- true perculas quite often have have a pure bright orange iris around the black pupil. This can give them the illusion of having smaller eyes, or a beady little eyed look.
- true percula clownfish usually have more black coloration on their bodies than the false percula. Also - wider black margins which divide the orange and white markings.
- false percula clownfish usually have thin black dividing margins between the orange and white. The overall darker coloration of the percula is seen by most hobbyists as the most easily recognizable difference between these two fish.
- other than the extra spines in the dorsal fin, these other signs aren't foolproof and are not always reliable.
- the main difference in these fish is regional. True percula clownfish come from Singapore and eastward to the Solomon Islands and southward to Australia. Ocellaris clownfish come from the islands west and north of Singapore. The western tip of Singapore is the dividing line for the territories of these two fish.
I've got a pair of false percs (tank raised) and I think they're great!
