while most ID methods are anecdotal, they can be helpfull..
its said, but not always true that, Perculas have more black, or thicker black borders and some say there eyes and mouths look different..
now technically, the only sure way to know is the Perculas will have 10 dorsal spines (rarely they will have 9)
and Ocellaris clowns will have 11 or sometimes 12.
the best way to get this, is a close up picture and then count them from the picture. they usually move too much to accuratly count otherwise
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