Aquarium Fish Database

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

Beginner – Intermediate

Reticulated Corydoras

Brochis reticulata

Adult size
≤ 2.4" (≤ 6.1 cm)
Aquarium size
≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
72–79°F (22–26°C)
Intermediate – Advanced

Reticulated Hillstream Loach

Sewellia lineolata

Adult size
≤ 2.6" (≤ 6.5 cm)
Aquarium size
26 US gal (100 L) or larger / ≥ 29.5" (≥ 75 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–75°F (20–24°C)
Intermediate

Rikbaktsa Corydoras

Hoplisoma rikbaktsa

Adult size
≤ 2" (≤ 5 cm)
Aquarium size
24 US gal (90 L) or larger
Temperament
Peaceful
Zone
Bottom dweller
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Rohani Barb

Dawkinsia rohani

Adult size
≤ 3.7" (≤ 9.5 cm)
Aquarium size
40 US gal (152 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
66–77°F (19–25°C)
Beginner – Intermediate

Roloff’s Pygmy Barb

Oreichthys parvus

Adult size
≤ 1.2" (≤ 3 cm)
Aquarium size
15 US gal (57 L) or larger
Temperament
peaceful
Zone
Middle swimmer
Temp
73–81°F (23–27°C)
Beginner – Intermediate

Rose Danio

Danio roseus

Adult size
≤ 2.2" (≤ 5.5 cm)
Aquarium size
30 US gal (112 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
64–77°F (18–25°C)
Beginner

Rosy Barb

Pethia conchonius

Adult size
≤ 3.9" (≤ 10 cm)
Aquarium size
32 US gal (120 L) or larger / ≥ 39.4" (≥ 100 cm) minimum length
Temperament
Peaceful
Zone
Middle swimmer
Temp
61–75°F (16–24°C)
Beginner – Intermediate

Rosy Loach

Tuberoschistura arakanensis

Adult size
≤ 1.2" (≤ 3 cm)
Temperament
Peaceful
Zone
Bottom dweller
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Rosy Tetra

Megalamphodus rosaceus

Adult size
≤ 1.6" (≤ 4 cm)
Aquarium size
16 US gal (60 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
75–82°F (24–28°C)
Intermediate – Advanced

Royal Plecostomus L190

Panaque nigrolineatus

Adult size
16–19.7" (40.6–50 cm)
Aquarium size
≥ 72" (≥ 182.88 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
73–84°F (23–29°C)
Beginner – Intermediate

Royal Whiptail Catfish

Sturisomatichthys panamensis

Adult size
≤ 10.2" (≤ 26 cm)
Aquarium size
79 US gal (300 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
79–84°F (26–29°C)
Intermediate – Advanced

Ruby Rasbora

Paedocypris progenetica

Adult size
≤ 0.4" (≤ 1 cm)
Temperament
Peaceful
Zone
Middle swimmer
Temp
79–88°F (26–31°C)
Intermediate

Ruby Tetra

Axelrodia riesei

Adult size
≤ 0.8" (≤ 2.1 cm)
Aquarium size
21 US gal (80 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Middle to top swimmer
Temp
68–82°F (20–28°C)
Intermediate

Rummy Nose Rasbora

Sawbwa resplendens

Adult size
≤ 1.4" (≤ 3.5 cm)
Aquarium size
20 US gal (76 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
All-zone swimmer
Temp
64–72°F (18–22°C)
Beginner – Intermediate

Rusty Corydoras

Osteogaster rabauti

Adult size
≤ 2.6" (≤ 6.5 cm)
Aquarium size
21 US gal (80 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–81°F (20–27°C)
Intermediate

Saddleback Loach

Homaloptera orthogoniata

Adult size
≤ 5.1" (≤ 13 cm)
Aquarium size
29 US gal (108 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–78°F (20–25.5°C)
Beginner – Intermediate

Sahul Rainbowfish

Melanotaenia sahulensis

Adult size
≤ 2" (≤ 5 cm)
Aquarium size
29 US gal (110 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
peaceful
Zone
Middle swimmer
Temp
70–79°F (21–26°C)
Intermediate – Advanced

Sailfin Tetra

Crenuchus spilurus

Adult size
≤ 2.8" (≤ 7 cm)
Aquarium size
26 US gal (100 L) or larger / ≥ 29.5" (≥ 75 cm) minimum length
Temperament
Peaceful
Zone
Bottom to middle swimmer
Temp
68–82°F (20–28°C)
Beginner – Intermediate

Salt and Pepper Corydoras

Hoplisoma habrosum

Adult size
≤ 1.4" (≤ 3.5 cm)
Aquarium size
14 US gal (54 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–79°F (20–26°C)
Intermediate – Advanced

Salvini Cichlid

Trichromis salvini

Adult size
≤ 8.7" (≤ 22 cm)
Aquarium size
40 US gal (150 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Aggressive
Zone
All-zone swimmer
Temp
72–79°F (22–26°C)
Beginner – Intermediate

Salween Rock Catfish

Hara filamentosa

Adult size
≤ 2" (≤ 5.2 cm)
Aquarium size
≥ 17.7" (≥ 45 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–75°F (20–24°C)
Intermediate – Advanced

Samurai Gourami

Sphaerichthys vaillanti

Adult size
≤ 2.2" (≤ 5.5 cm)
Aquarium size
16 US gal (60 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
Temperament
Peaceful
Zone
All-zone swimmer
Temp
70–77°F (21–25°C)
Intermediate

Sand Cichlid

Xenotilapia spiloptera

Adult size
≤ 3.9" (≤ 10 cm)
Temperament
Semi-Aggressive
Zone
Bottom to middle swimmer
Temp
79–82°F (26–28°C)
Beginner – Intermediate

Sands Corydoras

Hoplisoma davidsandsi

Adult size
≤ 2.4" (≤ 6 cm)
Aquarium size
26 US gal (100 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
Temperament
Peaceful
Zone
Bottom dweller
Temp
68–82°F (20–28°C)

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