Aquarium Fish Database

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

Beginner – Intermediate

Reticulated Corydoras

Corydoras reticulatas

Adult size
≤ 6 cm (≤ 2.4 in)
Temperament
Peaceful
Zone
Bottom dweller
Temp
22–26 °C
Intermediate – Advanced

Reticulated Hillstream Loach

Sewellia lineolata

Adult size
≤ 7 cm (≤ 2.8 in)
Aquarium size
100 L or larger / ≥ 80 cm (≥ 31.5 in) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
20–24 °C
Intermediate

Rikbaktsa Corydoras

Corydoras rikbaktsa

Adult size
≤ 6 cm (≤ 2.4 in)
Aquarium size
90 L or larger
Temperament
Peaceful
Zone
Bottom dweller
Temp
22–26 °C
Beginner – Intermediate

Rohani Barb

Dawkinsia rohani

Adult size
≤ 12 cm (≤ 4.7 in)
Aquarium size
152 L or larger / ≥ 120 cm (≥ 47.2 in) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
18–25 °C
Beginner – Intermediate

Roloff’s Pygmy Barb

Oreichthys parvus

Adult size
≤ 3 cm (≤ 1.2 in)
Aquarium size
57 L or larger
Temperament
Peaceful
Zone
Middle swimmer
Temp
23–27 °C
Beginner – Intermediate

Rose Danio

Danio roseus

Adult size
≤ 4 cm (≤ 1.6 in)
Aquarium size
112 L or larger / ≥ 80 cm (≥ 31.5 in) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
20–26 °C
Beginner

Rosy Barb

Puntius conchonius

Adult size
≤ 10 cm (≤ 3.9 in)
Aquarium size
120 L or larger / ≥ 100 cm (≥ 39.4 in) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
17–22 °C
Beginner – Intermediate

Rosy Loach

Tuberoschistura arakanensis

Adult size
≤ 3 cm (≤ 1.2 in)
Temperament
Peaceful
Zone
Bottom dweller
Temp
22–26 °C
Beginner – Intermediate

Rosy Tetra

Hyphessobrycon rosaceus

Adult size
≤ 5 cm (≤ 2 in)
Aquarium size
60 L or larger / ≥ 60 cm (≥ 23.6 in) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
24–28 °C
Intermediate – Advanced

Royal Plecostomus L190

Panaque nigrolineatus

Adult size
≤ 45 cm (≤ 17.7 in)
Temperament
Peaceful
Zone
Bottom dweller
Temp
22–30 °C
Beginner – Intermediate

Royal Whiptail Catfish

Sturisoma panamense

Adult size
≤ 20 cm (≤ 7.9 in)
Aquarium size
300 L or larger / ≥ 120 cm (≥ 47.2 in) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
20–26 °C
Intermediate – Advanced

Ruby Rasbora

Paedocypris progenetica

Adult size
≤ 1 cm (≤ 0.4 in)
Temperament
Peaceful
Zone
Middle swimmer
Temp
26–31 °C
Intermediate

Ruby Tetra

Axelrodia riesei

Adult size
≤ 2.5 cm (≤ 1 in)
Aquarium size
80 L or larger / ≥ 60 cm (≥ 23.6 in) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
20–27 °C
Intermediate

Rummy Nose Rasbora

Sawbwa resplendens

Adult size
≤ 3.5 cm (≤ 1.4 in)
Aquarium size
76 L or larger / ≥ 60 cm (≥ 23.6 in) minimum length
Temperament
Peaceful
Temp
21–23 °C
Beginner – Intermediate

Rusty Corydoras

Corydoras rabauti

Adult size
≤ 6.5 cm (≤ 2.6 in)
Aquarium size
80 L or larger
Temperament
Peaceful
Zone
Bottom dweller
Temp
22–26 °C
Intermediate

Saddleback Loach

Homaloptera orthogoniata

Adult size
≤ 12.5 cm (≤ 4.9 in)
Temperament
Peaceful
Zone
Bottom dweller
Temp
20–25 °C
Beginner – Intermediate

Sahul Rainbowfish

Melanotaenia sahulensis

Adult size
≤ 5.5 cm (≤ 2.2 in)
Aquarium size
110 L or larger / ≥ 80 cm (≥ 31.5 in) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
22–27 °C
Intermediate – Advanced

Sailfin Tetra

Crenuchus spilurus

Adult size
≤ 5.5 cm (≤ 2.2 in)
Aquarium size
100 L or larger
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
20–27 °C
Beginner – Intermediate

Salt and Pepper Corydoras

Corydoras habrosus

Adult size
≤ 3.5 cm (≤ 1.4 in)
Aquarium size
54 L or larger / ≥ 60 cm (≥ 23.6 in) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
20–27 °C
Intermediate – Advanced

Salvini Cichlid

Cichlasoma salvini

Adult size
≤ 22 cm (≤ 8.7 in)
Aquarium size
150 L or larger / ≥ 90 cm (≥ 35.4 in) minimum length
Temperament
Aggressive
Temp
22–26 °C
Beginner – Intermediate

Salween Rock Catfish

Erethistes filamentosus

Adult size
≤ 5 cm (≤ 2 in)
Temperament
Peaceful
Zone
Bottom dweller
Temp
20–24 °C
Intermediate – Advanced

Samurai Gourami

Sphaerichthys vaillanti

Adult size
≤ 7 cm (≤ 2.8 in)
Aquarium size
60 L or larger / ≥ 80 cm (≥ 31.5 in) minimum length
Temperament
Peaceful
Temp
24–28 °C
Intermediate

Sand Cichlid

Xenotilapia spiloptera

Adult size
≤ 10 cm (≤ 3.9 in)
Temperament
Semi-Aggressive
Zone
Bottom to middle swimmer
Temp
26–28 °C
Beginner – Intermediate

Sands Corydoras

Corydoras davidsandsi

Adult size
≤ 6 cm (≤ 2.4 in)
Aquarium size
100 L or larger / ≥ 90 cm (≥ 35.4 in) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
20–26 °C
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