Aquarium Fish Database

Explore freshwater aquarium fish by care level, size, temperament, swimming zone, water parameters, and compatibility.

Beginner – Intermediate

Jaintia Danio

Danio jaintianensis

Adult size
≤ 2" (≤ 5 cm)
Aquarium size
21 US gal (80 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
36–73°F (2–23°C)
Intermediate

Javan Red Lipstick Goby

Sicyopus rubicundus

Adult size
≤ 2.4" (≤ 6 cm)
Aquarium size
30 US gal (114 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
72–77°F (22–25°C)
Beginner

Jellybean Tetra

Ladigesia roloffi

Adult size
≤ 1.2" (≤ 3 cm)
Aquarium size
15 US gal (55 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–79°F (22–26°C)
Intermediate – Advanced

Jewel Cichlid

Rubricatochromis bimaculatus

Adult size
≤ 5.9" (≤ 15 cm)
Aquarium size
66 US gal (250 L) or larger / ≥ 39.4" (≥ 100 cm) minimum length
Temperament
Semi-Aggressive
Zone
Bottom to middle swimmer
Temp
72–81°F (22–27°C)
Beginner – Intermediate

Jeweled Splitfin

Xenotoca variata

Adult size
≤ 2.8" (≤ 7 cm)
Aquarium size
40 US gal (150 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
68–81°F (20–27°C)
Beginner – Intermediate

Jiangxi Golden Loach

Parabotia kiangsiensis

Adult size
≤ 3.1" (≤ 8 cm)
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–75°F (20–24°C)
Beginner – Intermediate

Junior Tetra

Hyphessobrycon robustulus

Adult size
≤ 1.8" (≤ 4.5 cm)
Aquarium size
13 US gal (50 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
73–79°F (23–26°C)
Beginner – Intermediate

Kamaka Rainbowfish

Melanotaenia kamaka

Adult size
≤ 2.8" (≤ 7 cm)
Aquarium size
32 US gal (120 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
72–81°F (22–27°C)
Beginner – Intermediate

Kane’s Corydoras

Hoplisoma kanei

Adult size
≤ 2" (≤ 5 cm)
Aquarium size
21 US gal (80 L) or larger / ≥ 19.7" (≥ 50 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–79°F (20–26°C)
Intermediate

Kansu Loach

Sinibotia robusta

Adult size
≤ 7.1" (≤ 18 cm)
Aquarium size
79 US gal (300 L) or larger / ≥ 55.1" (≥ 140 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
68–73°F (20–23°C)
Intermediate

Katibas Sucker Loach

Gastromyzon katibasensis

Adult size
≤ 2.8" (≤ 7 cm)
Temperament
Peaceful
Temp
68–79°F (20–26°C)
Beginner – Intermediate

Keeled Otocinclus

Oxyropsis carinata

Adult size
≤ 3.1" (≤ 8 cm)
Aquarium size
18 US gal (70 L) or larger / ≥ 27.6" (≥ 70 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–77°F (20–25°C)
Intermediate – Advanced

Kelberi Peacock Bass

Cichla kelberi

Adult size
≤ 19.7" (≤ 50 cm)
Aquarium size
185 US gal (700 L) or larger / ≥ 118.1" (≥ 300 cm) minimum length
Temperament
Semi-Aggressive
Zone
Middle swimmer
Temp
75–84°F (24–29°C)
Intermediate

Keyhole Cichlid

Cleithracara maronii

Adult size
≤ 4.9" (≤ 12.5 cm)
Aquarium size
29 US gal (110 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Kitty Tetra

Hyphessobrycon loweae

Adult size
≤ 1.6" (≤ 4 cm)
Aquarium size
13 US gal (50 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
73–81°F (23–27°C)
Intermediate

Knight Goby

Stigmatogobius sadanundio

Adult size
≤ 3.5" (≤ 9 cm)
Aquarium size
21 US gal (80 L) or larger / ≥ 27.6" (≥ 70 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
68–79°F (20–26°C)
Beginner – Intermediate

Kogal Blue Eyed Tetra

Moenkhausia sp.

Adult size
≤ 2.4" (≤ 6 cm)
Temperament
Peaceful
Zone
Middle swimmer
Temp
73–81°F (23–27°C)
Intermediate

Krabi Mouth Brooding Betta

Betta simplex

Adult size
≤ 2" (≤ 5 cm)
Aquarium size
14 US gal (54 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
72–81°F (22–27°C)
Beginner – Intermediate

Kribensis Cichlid

Pelvicachromis pulcher

Adult size
≤ 3.9" (≤ 10 cm)
Aquarium size
32 US gal (120 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
73–79°F (23–26°C)
Beginner – Intermediate

Krieg’s Mini Tetra

Serrapinnus kriegi

Adult size
≤ 1" (≤ 2.5 cm)
Aquarium size
53 US gal (200 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Lake Furnusu Rainbowfish

Melanotaenia mairasi

Adult size
≤ 3.1" (≤ 8 cm)
Aquarium size
26 US gal (100 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
70–79°F (21–26°C)
Beginner – Intermediate

Lake Inle Danio

Devario auropurpureus

Adult size
≤ 3.1" (≤ 8 cm)
Aquarium size
21 US gal (80 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
68–73°F (20–23°C)
Beginner – Intermediate

Lake Kurumoi Rainbowfish

Melanotaenia parva

Adult size
≤ 3.1" (≤ 8 cm)
Aquarium size
53 US gal (200 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
75–82°F (24–28°C)
Intermediate

Lake Kutubu Rainbowfish

Melanotaenia lacustris

Adult size
≤ 4.9" (≤ 12.5 cm)
Aquarium size
53 US gal (200 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
70–79°F (21–26°C)
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