| Species | Adult size | Temperament | Min tank | Care | Accuracy |
|---|---|---|---|---|---|
| Dalmatian Molly Poecilia spp. (domestic Dalmatian form) | 6–10 cm | Peaceful | 100 L | Easy | Verified |
| Demasoni Cichlid Chindongo demasoni | 6–8 cm | Aggressive | 180 L | Hard | Verified |
| Denison Barb Dawkinsia denisonii | 12–15 cm | Peaceful | 300 L | Moderate | Verified |
| Desert Goby Chlamydogobius eremius | 5–6 cm | Peaceful | 60 L | Moderate | Verified |
| Diamond Tetra Makunaima pittieri | 5–6 cm | Peaceful | 100 L | Moderate | Verified |
| Diptail Pencilfish Nannostomus eques | 4–5 cm | Peaceful | 60 L | Moderate | Verified |
| Discus Symphysodon spp. | 15–20 cm | Peaceful | 400 L | Hard | Verified |
| Dojo / Weather Loach Misgurnus anguillicaudatus | 15–25 cm | Peaceful | 240 L | Moderate | Verified |
| Dorado Catfish Brachyplatystoma rousseauxii | –192 cm | Semi aggressive | 0 L | Hard | Verified |
| Dovii Cichlid Parachromis dovii | 40–72 cm | Aggressive | 1,500 L | Hard | Verified |
| Dragon Blood Peacock Aulonocara hybrid | 10–12 cm | Semi aggressive | 280 L | Moderate | Verified |
| Duplicareus Corydoras Hoplisoma duplicareum | 5–6 cm | Peaceful | 80 L | Moderate | Verified |
| Dwarf Anchor Catfish Erethistes jerdoni | 2.5–4 cm | Peaceful | 60 L | Moderate | Verified |
| Dwarf Chain Loach Ambastaia sidthimunki | 5–6 cm | Semi aggressive | 100 L | Moderate | Verified |
| Dwarf Corydoras Gastrodermus hastatus | 2.5–3.5 cm | Peaceful | 45 L | Easy | Verified |
| Dwarf Gourami Trichogaster fasciata | 5–9 cm | Semi aggressive | 80 L | Moderate | Verified |
| Dwarf Neon Rainbowfish Melanotaenia praecox | 5–6 cm | Peaceful | 120 L | Easy | Verified |
| Dwarf Pencilfish Nannostomus marginatus | 2.5–3.5 cm | Peaceful | 60 L | Moderate | Verified |
| Dwarf Pike Cichlid Wallaciia compressiceps | 7–10 cm | Aggressive | 180 L | Hard | Verified |
| Dwarf Rasbora Boraras maculatus | 1.5–2.5 cm | Peaceful | 30 L | Moderate | Verified |