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i would go with a dwarf gourami. they are very beautiful fish. i have 7 in my 45 gal. i would go with a male but in a ten gallon you could only have that one fish. i would also use live plants and maybe a few shrimp. here's a care guide on the dwarf gourami. good luck. Tropical Fish for Freshwater Aquariums: Dwarf Gourami Labyrinth Fish