Yes, angels live with neons in the wild, but you have to remember that they can grow very large, and what else comes with size? the potential to consume it's fellow tank mates.
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If you have a big enough tank with enough hiding places, pH of around 7, you can keep virtually any fish together as long as all the fish are around the same size and these two groups of fish are avioded:
Serrasalmus
Tetradon(figure eights and dwarfs are the
exception).
I keep a successful community of fish in a 4 foot tank including the following families:
Cichlids, tetras, loaches, gouramis, barbs, rainbows, livebearers, killiefish, catfish, puffers.
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