my favourites in the rainbow family are blue-eyes (Pseudomugil family). i don't know if you can get them easily outside of australia, but if you can, they're such awesome little (less than 2") fish. there's lots of different types.
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50gal planted - yoyo loaches, BNs, odessa barbs, giant danios
33gal planted - praecox rainbows, gold ram, bolivian rams, sparkling gouramis, licorice gouramis, lots of shrimp
2 x 5gal planted - bettas
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