Beginner – IntermediateNeon Tetra
Paracheirodon innesi
- Adult size
- up to 8.5 cm
- Aquarium size
- 120 L or larger
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 20–26 °C
Aquarium Fish Database
Explore freshwater aquarium fish by care level, size, temperament, swimming zone, water parameters, and compatibility.
Beginner – Intermediate
Intermediate – AdvancedNetted Leporinus
Leporinus reticulatus
- Adult size
- up to 15 cm
- Aquarium size
- 160 L or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 20–27 °C
Beginner – IntermediateNigeria Red Kribensis Cichlid
Pelvicachromis taeniatu
- Adult size
- up to 9 cm
- Aquarium size
- 200 L or larger
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 22–26 °C
Beginner – IntermediateNijssens Corydoras
Corydoras nijsseni
- Adult size
- up to 5 cm
- Aquarium size
- 60 L or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 22–25 °C
Beginner – IntermediateNinja Woodcat
Tatia musaica
- Adult size
- up to 6 cm
- Aquarium size
- 60 L or larger
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 22–26 °C
Beginner – IntermediateNkhomo-benga Peacock Cichlid
Aulonocara baenschi
- Adult size
- up to 12 cm
- Aquarium size
- 200 L or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 24–28 °C
Beginner – IntermediateNormans Lampeye Killifish
Poropanchax normani
- Adult size
- up to 4 cm
- Aquarium size
- 45 L or larger
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 22–26 °C
Beginner – IntermediateNorthern Mountain Swordtail
Xiphophorus nezahualcoyotl
- Adult size
- up to 6 cm
- Aquarium size
- 80 L or larger
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 22–26 °C
IntermediateOcellated Snakehead
Channa pleurophthalma
- Adult size
- up to 40 cm
- Aquarium size
- 300 L or larger
- Temperament
- Semi-Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 22–28 °C
IntermediateOcellifer Catfish
Synodontis ocellifer
- Adult size
- up to 20 cm
- Aquarium size
- 240 L or larger
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 23–28 °C
BeginnerOdessa Barb
Pethia padamya
- Adult size
- up to 7 cm
- Aquarium size
- 80 L or larger
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 24–26 °C
Beginner – IntermediateOmba Rainbowfish
Melanotaenia dumasi
- Adult size
- up to 12 cm
- Aquarium size
- 120 L or larger
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 25–28 °C
Beginner – IntermediateOne-Lined Pencilfish
Nannostomus unifasciatus
- Adult size
- up to 7 cm
- Aquarium size
- 80 L or larger
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 23–28 °C
Beginner – IntermediateOnesided Livebearer
Jenynsia lineata
- Adult size
- up to 12 cm
- Aquarium size
- 120 L or larger
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 18–25 °C
IntermediateOnespot Squeaker
Synondontis notatus
- Adult size
- up to 25 cm
- Aquarium size
- 300 L or larger
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 22–26 °C
Intermediate – AdvancedOrange Spotted Snakehead
Channa aurantimaculata
- Adult size
- up to 40 cm
- Aquarium size
- 300 L or larger
- Temperament
- Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 10–28 °C
Beginner – IntermediateOrange Striped Catfish
Synodontis flavitaeniatus
- Adult size
- up to 16 cm
- Aquarium size
- 240 L or larger
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 23–28 °C
Intermediate – AdvancedOrinoco Peacock Bass
Cichla orinocensis
- Adult size
- up to 60 cm
- Aquarium size
- 900 L or larger
- Temperament
- Aggressive
- Zone
- Middle swimmer
- Temp
- 26–29 °C
Intermediate – AdvancedOrnate Bichir
Polypterus ornatipinnis
- Adult size
- up to 60 cm
- Aquarium size
- 900 L or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 25–28 °C
Beginner – IntermediateOrnate Borneo Sucker
Gastromyzon ornaticauda
- Adult size
- up to 7 cm
- Aquarium size
- 80 L or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 20–24 °C
IntermediateOrnate Ctenopoma
Microctenopoma ansorgii
- Adult size
- up to 8 cm
- Aquarium size
- 80 L or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 20–26 °C
Beginner – IntermediateOrnate Rainbowfish
Rhadinocentrus ornatus
- Adult size
- up to 8 cm
- Aquarium size
- 80 L or larger
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 20–27 °C
IntermediateOrnate Tetra
Hyphessobrycon bentosi
- Adult size
- up to 5 cm
- Aquarium size
- 45 L or larger
- Temperament
- Peaceful
- Temp
- 22–27 °C
IntermediateOrtegai Apistogramma
Apistogramma ortegai
- Adult size
- up to 8 cm
- Aquarium size
- 120 L or larger
- Temperament
- Semi-Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 22–28 °C
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