Well, here's my two cents worth on finding (true) Nemo. I don't see a problem with the photos. The two A. perculas look correctly identified (though I'm no pomacentrid expert). I think there may be a little confusion on how wide the black lines should be. From the photos in several books I have by Gerry Allen (the ichthyologist who first noted that there were two different species involved), the lines when present in A. ocellaris are very narrow (except in a melanistic form from NW Australia, which lacks any orange between the white bars - the areas between the bars are entirely black). They do not have to be really broad to make it an A. percula.
Here's the key couplet (number 16) from Gerry's 1975 (2nd ed.) of "Anemonefishes", which was based on his PhD work on the group:
16a. Dorsal spines almost always XI (occasionally X); length of tallest dorsal spine 2.1 to 2.9 in head length; pectoral rays usually 17; area between bars usually pale except in melanistic specimens from northern Australia (northern Australia; Malayan-Indonesian region; eastern Indian Ocean; Philippines; So. China Sea; Ryukyus; southern Japan) .... ocellaris
16b. Dorsal spines IX or X (usually X); length of tallest dorsal spine 3.0-3.4 in head length; pectoral rays usually 16; areas between bars frequently blackish (New Caledonia; New Hebrides; Solomon Islands; New Guinea; Queensland) .... percula
The interesting thing to note is that he alludes to more overlap in characters than is usually acknowledged (particularly with regard to the black edging). I have several subsequent publications by Gerry, and aside from updating the names of localities (and clarifying "northern Australia" for A. ocellaris to "northwestern Australia") there is isn't a lot of change in the diagnoses. Well, that's except for his contribution to the 2001 FAO Species Identification Guide for the Western Central Pacific where I think the editors screwed up. (There are two illustrations for each species, a light variety and a dark variety illustration each for A. ocellaris, and a typical and "Melanesia variety" for A. percula. Unfortunately, they incorrectly re-used the light variety illustration of A. ocellaris as the illustration of typical A. percula!)
And now to throw the cat among the pigeons: I'm not sure whether these characters will work very well for captive bred fish, given the possible effects of inbreeding and possible trait selection by breeders. (There's now an astounding amount of variation in captive bred individuals of the related A. biaculeatus, presumably because breeders are selecting for various colour patterns.) Certainly I could imagine that the colour patterns may not be that representative in captive bred fish, and I doubt anyone has looked at the remaining characters to see if they are now more variable. (I've seen this in other captive bred species.) Moreover, given the difficulty in identifying the two species, it would not even surprise me if some of the captive bred individuals were hybrids between the two species because breeders did not correctly identify their brood stock.
Tony