Most fish stores will have freshwater angels. Saltwater fish are sometimes harder to find. For angels you need a fully cycled, established tank as they are somewhat delicate and don't do well in bad water conditions.
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I have 2 medium-large ones, 1 is black marble, the other is silver, i dont know what sex they are though but they seem to get along just fine, somtimes they swim together, and other times, they butt eachother out of way, and swim alone, but this usually only lasts about 2 mins lol, maybe they are 2 males? I dont know