| Species | Adult size | Temperament | Min tank | Care | Accuracy |
|---|---|---|---|---|---|
| Bucktooth Tetra Exodon paradoxus | 7–10 cm | Aggressive | 300 L | Hard | Verified |
| Buenos Aires Tetra Psalidodon anisitsi | 6–8 cm | Semi aggressive | 120 L | Easy | Verified |
| Buenos Aires Tetra Variant Psalidodon anisitsi domestic form | 6–8 cm | Semi aggressive | 120 L | Easy | Verified |
| Bumblebee Catfish Microglanis iheringi | 6–9 cm | Peaceful | 80 L | Moderate | Verified |
| Bumblebee Goby Brachygobius doriae | 3.5–4.2 cm | Semi aggressive | 60 L | Moderate | Verified |
| Bumblebee Mbuna Pseudotropheus crabro | 12–16 cm | Aggressive | 300 L | Hard | Verified |
| Burmese Border Loach Botia kubotai | 10–13 cm | Semi aggressive | 250 L | Moderate | Verified |
| Burundi Frontosa Cyphotilapia frontosa | 25–33 cm | Semi aggressive | 900 L | Hard | Verified |
| Butterfly Cichlid (Anomalochromis) Anomalochromis thomasi | 5–6.5 cm | Peaceful | 80 L | Easy | Verified |
| Calvus Cichlid Altolamprologus calvus | 10–13.5 cm | Semi aggressive | 200 L | Hard | Verified |
| Cardinal Tetra Paracheirodon axelrodi | 3–4 cm | Peaceful | 70 L | Moderate | Verified |
| Caudopunctatus Cichlid Neolamprologus caudopunctatus | 6–7 cm | Semi aggressive | 100 L | Moderate | Verified |
| Celebes Halfbeak Nomorhamphus liemi | 7–9 cm | Semi aggressive | 120 L | Moderate | Verified |
| Celebes Medaka Ricefish Oryzias celebensis | 3–4.5 cm | Peaceful | 60 L | Moderate | Verified |
| Celebes Rainbowfish Marosatherina ladigesi | 6–8 cm | Peaceful | 120 L | Moderate | Verified |
| Celestial Pearl Danio Danio margaritatus | 2–2.5 cm | Peaceful | 45 L | Moderate | Verified |
| Checker Barb Oliotius oligolepis | 4–5 cm | Peaceful | 60 L | Easy | Verified |
| Checkerboard Cichlid Dicrossus filamentosus | 5–9 cm | Peaceful | 100 L | Hard | Verified |
| Cherry Barb Rohanella titteya | 3–5 cm | Peaceful | 60 L | Easy | Verified |
| Cherry Barb Hybrid Puntius hybrid | 3–5 cm | Peaceful | 60 L | Easy | Verified |
| Cherry Shrimp Neocaridina davidi | 2–3 cm | Peaceful | 30 L | Easy | Verified |
| Chili Rasbora Boraras brigittae | 1.8–3.5 cm | Peaceful | 40 L | Moderate | Verified |
| Chinese Algae Eater Gyrinocheilus aymonieri | 20–25 cm | Semi aggressive | 300 L | Moderate | Verified |
| Chocolate Cichlid Hypselecara temporalis | 22–30 cm | Semi aggressive | 450 L | Moderate | Verified |
| Chocolate Gourami Sphaerichthys osphromenoides | 4.5–6 cm | Peaceful | 90 L | Hard | Verified |