puffers are pretty agressive, they will probably nip at the angels
the gourami may also
i would have gone with the angels being the main fish in the tank, along with some corys, a schooling fish(angels eat neons, so i chose rasboras, and they are great), maybe a dwarf pleco, and some blue rams
bala sharks grow up to 13 inches, so thats a no no for the tank, red tails i'm not so sure about, both are cyprinids, but the bala is actually a carp
in my 55 i decided to go with a south american peaceful cichlid theme, Discus, Angels, Blue rams, and then some dither fish, like corys and rasboras
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