Aquarium Fish Database

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

Beginner – Intermediate

Narayan Barb

Pethia setnai

Adult size
≤ 2.8" (≤ 7 cm)
Aquarium size
21 US gal (81 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
68–79°F (20–26°C)
Beginner – Intermediate

Nego Dagua Tetra

Hasemania negodagua

Adult size
≤ 1.2" (≤ 3 cm)
Aquarium size
20 US gal (75 L) or larger
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
73–81°F (23–27°C)
Intermediate

Neon Blue Rasbora

Sundadanio axelrodi

Adult size
≤ 0.8" (≤ 2 cm)
Aquarium size
11 US gal (40 L) or larger / ≥ 19.7" (≥ 50 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Neon Borneo Sucker

Gastromyzon lepidogaster

Adult size
≤ 3.9" (≤ 10 cm)
Aquarium size
29 US gal (108 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
64–75°F (18–24°C)
Beginner – Intermediate

Neon Green Rasbora

Microdevario kubotai

Adult size
≤ 0.8" (≤ 2 cm)
Aquarium size
14 US gal (54 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–81°F (22–27°C)
Beginner – Intermediate

Neon Red Rasbora

Sundadanio rubellus

Adult size
≤ 0.8" (≤ 2 cm)
Aquarium size
11 US gal (40 L) or larger / ≥ 19.7" (≥ 50 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–79°F (22–26°C)
Intermediate – Advanced

Netted Leporinus

Leporinus reticulatus

Adult size
≤ 5.9" (≤ 15 cm)
Aquarium size
125 US gal (473 L) or larger
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
68–81°F (20–27°C)
Beginner – Intermediate

Nigeria Red Kribensis Cichlid

Pelvicachromis taeniatu

Adult size
≤ 3.5" (≤ 9 cm)
Temperament
Peaceful
Zone
Middle swimmer
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Nijssens Corydoras

Gastrodermus nijsseni

Adult size
≤ 2" (≤ 5 cm)
Aquarium size
11 US gal (43 L) or larger / ≥ 19.7" (≥ 50 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
72–77°F (22–25°C)
Beginner – Intermediate

Ninja Woodcat

Tatia musaica

Adult size
≤ 2.4" (≤ 6 cm)
Aquarium size
20 US gal (75 L) or larger
Temperament
Peaceful
Zone
Bottom dweller
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Nkhomo-benga Peacock Cichlid

Aulonocara baenschi

Adult size
≤ 4.7" (≤ 12 cm)
Aquarium size
53 US gal (200 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
75–82°F (24–28°C)
Beginner – Intermediate

Normans Lampeye Killifish

Poropanchax normani

Adult size
≤ 1.6" (≤ 4 cm)
Aquarium size
20 US gal (76 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Northern Mountain Swordtail

Xiphophorus nezahualcoyotl

Adult size
≤ 2.4" (≤ 6 cm)
Aquarium size
40 US gal (150 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
72–79°F (22–26°C)
Advanced

Ocellated Snakehead

Channa pleurophthalma

Adult size
13.8–15.7" (35–40 cm)
Aquarium size
238 US gal (900 L) or larger / ≥ 94.5" (≥ 240 cm) minimum length
Temperament
Semi-Aggressive
Zone
Bottom to middle swimmer
Temp
72–82°F (22–28°C)
Intermediate

Ocellifer Catfish

Synodontis ocellifer

Adult size
≤ 7.9" (≤ 20 cm)
Aquarium size
132 US gal (500 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
73–82°F (23–28°C)
Beginner

Odessa Barb

Pethia padamya

Adult size
≤ 2.8" (≤ 7 cm)
Aquarium size
17 US gal (65 L) or larger / ≥ 29.5" (≥ 75 cm) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
75–79°F (24–26°C)
Beginner – Intermediate

Omba Rainbowfish

Melanotaenia dumasi

Adult size
≤ 4.7" (≤ 12 cm)
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
77–82°F (25–28°C)
Beginner – Intermediate

One-Lined Pencilfish

Nannostomus unifasciatus

Adult size
≤ 2.8" (≤ 7 cm)
Aquarium size
16 US gal (60 L) or larger / ≥ 29.5" (≥ 75 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
73–82°F (23–28°C)
Beginner – Intermediate

Onesided Livebearer

Jenynsia lineata

Adult size
≤ 4.7" (≤ 12 cm)
Aquarium size
29 US gal (110 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
64–77°F (18–25°C)
Intermediate

Onespot Squeaker

Synodontis notatus

Adult size
≤ 9.8" (≤ 25 cm)
Aquarium size
79 US gal (300 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
72–79°F (22–26°C)
Intermediate – Advanced

Orange Spotted Snakehead

Channa aurantimaculata

Adult size
≤ 15.7" (≤ 40 cm)
Aquarium size
159 US gal (600 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length
Temperament
Aggressive
Zone
Bottom to middle swimmer
Temp
50–82°F (10–28°C)
Beginner – Intermediate

Orange Striped Catfish

Synodontis flavitaeniatus

Adult size
≤ 6.3" (≤ 16 cm)
Aquarium size
53 US gal (200 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
73–82°F (23–28°C)
Intermediate – Advanced

Orinoco Peacock Bass

Cichla orinocensis

Adult size
≤ 23.6" (≤ 60 cm)
Aquarium size
350 US gal (1325 L) or larger / ≥ 94.5" (≥ 240 cm) minimum length
Temperament
Aggressive
Zone
Middle swimmer
Temp
79–84°F (26–29°C)
Intermediate – Advanced

Ornate Bichir

Polypterus ornatipinnis

Adult size
≤ 23.6" (≤ 60 cm)
Aquarium size
171 US gal (648 L) or larger / ≥ 70.9" (≥ 180 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
77–82°F (25–28°C)
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