The cory's can be different (though they most prefer their own kind and I think a school of the same fish look best aesthtically).
Gouramis I'm not sure about. You might be able to have a couple of males of the same kind, in a big tank, but gouramis can be awfully territorial and one would get picked on. I'd get one male, two or three females of the same species. (three spot or dwarf and any of its color morphs would work well).
Some kind of bigger tetra might work with the listed fish. Maybe some small cichlids (I'm just guessing, I really don't know much about cichlids). Maybe some of the non-bitesized livebearers (platies are really colorful, I adore the orange ones).
Gouramis I'm not sure about. You might be able to have a couple of males of the same kind, in a big tank, but gouramis can be awfully territorial and one would get picked on. I'd get one male, two or three females of the same species. (three spot or dwarf and any of its color morphs would work well).
Some kind of bigger tetra might work with the listed fish. Maybe some small cichlids (I'm just guessing, I really don't know much about cichlids). Maybe some of the non-bitesized livebearers (platies are really colorful, I adore the orange ones).
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