Longnose Peppermint Otocinclus
Rhinotocinclus longirostris
- Adult size
- ≤ 1" (≤ 2.5 cm)
- Aquarium size
- ≥ 23.6" (≥ 60 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 75–81°F (24–27°C)
Aquarium Fish Database
Explore freshwater aquarium fish by care level, size, temperament, swimming zone, water parameters, and compatibility.
Longsnout distichodus
Distichodus lusosso
- Adult size
- ≤ 15" (≤ 38 cm)
- Aquarium size
- 396 US gal (1500 L) or larger / ≥ 118.1" (≥ 300 cm) minimum length
- Temperament
- Variable; may be aggressive to conspecifics and slower fish.
- Zone
- Bottom to middle swimmer
- Temp
- 72–79°F (22–26°C)
Loreto Tetra
Hyphessobrycon loretoensis
- Adult size
- ≤ 1" (≤ 2.5 cm)
- Aquarium size
- 16 US gal (60 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 72–82°F (22–28°C)
Lumbantobing Goby
Pseudogobiopsis lumbantobing
- Adult size
- ≤ 1.3" (≤ 3.4 cm)
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 72–82°F (22–28°C)
Lyretail Killifish
Aphyosemion australe
- Adult size
- ≤ 2.4" (≤ 6 cm)
- Aquarium size
- 8 US gal (30 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 70–75°F (21–24°C)
Macmasters Apistogramma
Apistogramma macmasteri
- Adult size
- ≤ 2.2" (≤ 5.5 cm)
- Aquarium size
- 26 US gal (100 L) or larger / ≥ 17.7" (≥ 45 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 75–82°F (24–28°C)
Madagascar Rainbowfish
Bedotia madagascariensis
- Adult size
- ≤ 3.9" (≤ 10 cm)
- Aquarium size
- 32 US gal (120 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 75–77°F (24–25°C)
Magnificent Killifish
Hypsolebias magnificus
- Adult size
- ≤ 2" (≤ 5 cm)
- Aquarium size
- ≥ 31.5" (≥ 80 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 72–77°F (22–25°C)
Mahecola Barb
Puntius mahecola
- Adult size
- ≤ 5" (≤ 12.6 cm)
- Aquarium size
- 26 US gal (100 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 64–75°F (18–24°C)
Malabar Danio
Devario malabaricus
- Adult size
- ≤ 4.7" (≤ 12 cm)
- Aquarium size
- 64 US gal (243 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 64–77°F (18–25°C)
Malayan Bumblebee Catfish
Leiocassis poeciloptera
- Adult size
- ≤ 6.7" (≤ 17 cm)
- Temperament
- Predatory toward small fish; fin nipping possible.
- Zone
- Bottom dweller
- Temp
- 68–77°F (20–25°C)
Mamou Killifish
Scriptaphyosemion guignardi
- Adult size
- ≤ 2.4" (≤ 6 cm)
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 70–77°F (21–25°C)
Marble Hatchetfish
Carnegiella strigata
- Adult size
- ≤ 1.4" (≤ 3.5 cm)
- Aquarium size
- 26 US gal (100 L) or larger / ≥ 29.5" (≥ 75 cm) minimum length
- Temperament
- Peaceful
- Zone
- Top swimmer
- Temp
- 68–82°F (20–28°C)
Marble Knifefish
Adontosternarchus balaenops
- Adult size
- ≤ 9.8" (≤ 25 cm)
- Aquarium size
- ≥ 59.1" (≥ 150 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 75–82°F (24–28°C)
Marble Sturisoma Whiptail Catfish
Sturisomatichthys aureus
- Adult size
- ≤ 7.9" (≤ 20 cm)
- Aquarium size
- 79 US gal (300 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 75–82°F (24–28°C)
Marbled Hatchetfish
Carnegiella strigata
- Adult size
- ≤ 1.8" (≤ 4.5 cm)
- Aquarium size
- 26 US gal (100 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
- Temperament
- Peaceful
- Zone
- Top swimmer
- Temp
- 75–82°F (24–28°C)
Marbled Headstander
Abramites hypselonotus
- Adult size
- ≤ 5.5" (≤ 14 cm)
- Aquarium size
- 132 US gal (500 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 68–86°F (20–30°C)
Marbled Sleeper Goby
Oxyeleotris marmorata
- Adult size
- ≤ 25.6" (≤ 65 cm)
- Aquarium size
- 149 US gal (565 L) or larger / ≥ 59.1" (≥ 150 cm) minimum length
- Temperament
- Semi-Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 72–82°F (22–28°C)
Marliers Julie
Julidochromis marlieri
- Adult size
- ≤ 5.9" (≤ 15 cm)
- Aquarium size
- 29 US gal (110 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Semi-Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 73–81°F (23–27°C)
Mascara Barb
Dawkinsia assimilis
- Adult size
- ≤ 4.7" (≤ 12 cm)
- Aquarium size
- 64 US gal (243 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 66–77°F (19–25°C)
Mbu Pufferfish
Tetraodon mbu
- Adult size
- ≤ 29.5" (≤ 75 cm)
- Aquarium size
- 514 US gal (1944 L) or larger / ≥ 94.5" (≥ 240 cm) minimum length
- Temperament
- Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 75–79°F (24–26°C)
Megaptera Apistogramma
Apistogramma megaptera
- Adult size
- ≤ 2.8" (≤ 7 cm)
- Aquarium size
- 26 US gal (100 L) or larger / ≥ 39.4" (≥ 100 cm) minimum length
- Temperament
- Semi-Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 79–82°F (26–28°C)
Megasema Eartheater
Geophagus megasema
- Adult size
- ≤ 7.4" (≤ 18.9 cm)
- Aquarium size
- 171 US gal (648 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 72–86°F (22–30°C)
Meghalaya Danio
Danio meghalayensis
- Adult size
- ≤ 3.1" (≤ 8 cm)
- Aquarium size
- 79 US gal (300 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 61–70°F (16–21°C)
