Species Library — All Species
| Species | Adult size | Temperament | Min tank | Care | Accuracy |
|---|---|---|---|---|---|
| McCullochs Rainbowfish Melanotaenia maccullochi | 6–8 cm | Peaceful | 120 L | Moderate | Verified |
| Merry Widow Livebearer Phallichthys amates | 4–6 cm | Peaceful | 60 L | Easy | Verified |
| Mono Argentus Monodactylus argenteus | 20–27 cm | Peaceful | 650 L | Hard | Verified |
| Moonlight Gourami Trichopodus microlepis | 12–15 cm | Semi aggressive | 250 L | Easy | Verified |
| Moth Catfish Erethistes hara | 10–13 cm | Peaceful | 150 L | Moderate | Verified |
| Mystery Snail Pomacea diffusa | 4–6 cm | Peaceful | 40 L | Easy | Verified |
| Nannacara Anomala Nannacara anomala | 4–7 cm | Peaceful | 90 L | Moderate | Verified |
| Neon Tetra Paracheirodon innesi | 2.5–4 cm | Peaceful | 60 L | Easy | Verified |
| Nerite Snail Neritina sp. | 2–3 cm | Peaceful | 30 L | Easy | Verified |
| Nicaraguan Cichlid Hypsophrys nicaraguensis | 20–25 cm | Semi aggressive | 300 L | Moderate | Verified |
| Norman Lampeye Poropanchax normani | 3–4 cm | Peaceful | 60 L | Easy | Verified |
| OB Peacock Cichlid Aulonocara hybrid | 10–12 cm | Semi aggressive | 250 L | Moderate | Verified |
| Ocellatus Shell Dweller Neolamprologus ocellatus | 4–6 cm | Semi aggressive | 70 L | Moderate | Verified |
| Odessa Barb Pethia padamya | 5–7 cm | Semi aggressive | 100 L | Easy | Verified |
| Odessa Barb Gold Variant Pethia padamya (domestic Gold form) | 5–7 cm | Semi aggressive | 90 L | Easy | Verified |
| Orange Chromide Pseudetroplus maculatus | 7–9.5 cm | Peaceful | 150 L | Moderate | Verified |
| Orange Laser Corydoras Osteogaster sp. CW010 | 5–6 cm | Peaceful | 80 L | Moderate | Verified |
| Orange-Finned Danio Danio kyathit | 4–5 cm | Peaceful | 90 L | Easy | Verified |
| Oscar Astronotus ocellatus | 25–35 cm | Semi aggressive | 450 L | Moderate | Verified |
| Oscar Tiger Variant Astronotus ocellatus (domestic Tiger form) | 25–35 cm | Semi aggressive | 450 L | Moderate | Verified |
| Otocinclus Otocinclus sp. | 3–4.5 cm | Peaceful | 70 L | Moderate | Verified |
| Panda Barb Haludaria melanampyx | 6–7.5 cm | Semi aggressive | 180 L | Moderate | Verified |
| Panda Corydoras Hoplisoma panda | 3.5–4.5 cm | Peaceful | 80 L | Moderate | Verified |
| Panda Garra Garra flavatra | 7–10 cm | Peaceful | 200 L | Moderate | Verified |
| Panda Loach Yaoshania pachychilus | 5–6 cm | Peaceful | 90 L | Hard | Verified |
Not sure which fish fit your aquarium?
Find fish for your tank
Enter your tank volume and optional dimensions to browse
verified fish whose minimum aquarium guide fits your setup.