@Gondwana it's most likely an Ocellaris Clownfish. Very similar to the Percula, but more common in aquaria iirc because they're hardier, easier to obtain and cheaper than Perculas. It's difficult to tell which is the one in the pic, because the main way to tell them apart is the thickness of the black edging of the white bands, but it's a black morph so you cant tell. The smaller fish in the background are definitely Ocellaris, so it's likely the black one is too.
