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I just got this butterflyfish yesterday and i was just trying to figure out what kind it is. I've seen similar ones on the internet but none that are exact.
Me too and i actually just found it. It is a black-backed butterfly. Thanks for taking the time to look. One other question do you know what to feed them other than just the normal pellets i have for my fish.
No, it's not a black back (Chaetodon melannotus), but a very close relative, a spot-tail butterflyfish (Chaetodon ocellicaudus): see Spot-tail butterflyfish - Wikipedia, the free encyclopedia. The two species are very similar, so I suspect requirements would be also similar.