| Bala shark, Tricolor sharkminnow, Tricolor Shark, Silver shark |
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| Bearded catfish, Banded cory, Giant cory |
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| Beckford’s pencil fish |
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| Bentos tetra, False rosy tetra, White-tipped tetra, Ornate tetra |
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| Black Molly, Liberty Molly, Short-Finned Molly, Molly |
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| Black Neon Tetra |
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| Black Phantom Tetra |
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| Black collared catfish |
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| Black striped limia, Hump-backed livebearer |
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| Blackbelly Limia |
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| Bleeding heart tetra |
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| Bleher’s rainbowfish |
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| Blue dolphin cichlid |
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| Blue gourami |
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| Blue-spotted Corydoras |
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| Boesemans rainbow fish |
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| Brass tetra, Gold tetra, Armstrongs tetra |
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| Bristlenose catfish, Temmincks bristlenose |
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| Bronze corycat, Gold striped cory |
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| Browns anabantid |
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| Buenos Aires Tetra |
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| Butterfly cichlid, Ram |
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| Butterfly goodeid |
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