To quote Fishboy42 from RC, "......The key to identifying them is the color of the pelvic fins (it's more easily seen in the picture of them as a younger pair)--they are red in tomato clowns and black in melanopus (cinnamon) clowns. They can darken with age, even in tomatos, but they are fully jet-black in cinnamon clowns. Of course with red pelvic fins they could be A. barberi or A. rubrocinctus, but they are less common species (collected from Fiji and Northwestern Australia, respectively). The head bars to remind me of the Fiji "cinnamon" as it was called before it was recently described. If you know collection location, you can narrow down the species type. Hope this helps!"