Tank Math Lab

Freshwater fish group

Tetras & rasboras

Small schooling fish with a wide range of colors, patterns and community-tank personalities.

22 profiles in this category. Each card uses a small directory thumbnail; open a profile for the larger reference image and full care notes.

Browse by group

Choose another group

View database overview
22 profiles shown
Neon tetra (Paracheirodon innesi) in an aquarium

Tetras & rasboras

Neon tetra

Paracheirodon innesi

3.5 cm adult10 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Cardinal tetra (Paracheirodon axelrodi) in an aquarium

Tetras & rasboras

Cardinal tetra

Paracheirodon axelrodi

4.5 cm adult20 gal minimum

Generally peaceful in a suitable community. Prefers warmer water than neons.

View care profile
Ember tetra (Hyphessobrycon amandae) in an aquarium

Tetras & rasboras

Ember tetra

Hyphessobrycon amandae

2 cm adult10 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Black skirt tetra (Gymnocorymbus ternetzi) in an aquarium

Tetras & rasboras

Black skirt tetra

Gymnocorymbus ternetzi

5.5 cm adult20 gal minimum

Active; may nip fins in small groups. A practical community profile with adult-size guidance.

View care profile
Serpae tetra (Hyphessobrycon eques) in an aquarium

Tetras & rasboras

Serpae tetra

Hyphessobrycon eques

4 cm adult20 gal minimum

Active; may nip fins in small groups. A practical community profile with adult-size guidance.

View care profile
Rummy-nose tetra (Hemigrammus bleheri) in an aquarium

Tetras & rasboras

Rummy-nose tetra

Hemigrammus bleheri

5 cm adult29 gal minimum

Generally peaceful in a suitable community. Sensitive to poor water quality; add to mature tanks.

View care profile
Harlequin rasbora (Trigonostigma heteromorpha) in an aquarium

Tetras & rasboras

Harlequin rasbora

Trigonostigma heteromorpha

4.5 cm adult20 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Chili rasbora (Boraras brigittae) in an aquarium

Tetras & rasboras

Chili rasbora

Boraras brigittae

2 cm adult5 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Congo tetra (Phenacogrammus interruptus) in an aquarium

Tetras & rasboras

Congo tetra

Phenacogrammus interruptus

8 cm adult40 gal minimum

Generally peaceful in a suitable community. Needs open swimming room and a secure lid; males develop flowing fins.

View care profile
Glowlight tetra (Hemigrammus erythrozonus) in an aquarium

Tetras & rasboras

Glowlight tetra

Hemigrammus erythrozonus

4 cm adult15 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Lemon tetra (Hyphessobrycon pulchripinnis) in an aquarium

Tetras & rasboras

Lemon tetra

Hyphessobrycon pulchripinnis

4.5 cm adult20 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Black neon tetra (Hyphessobrycon herbertaxelrodi) in an aquarium

Tetras & rasboras

Black neon tetra

Hyphessobrycon herbertaxelrodi

4 cm adult15 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
X-ray tetra (Pristella maxillaris) in an aquarium

Tetras & rasboras

X-ray tetra

Pristella maxillaris

4.5 cm adult20 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Emperor tetra (Nematobrycon palmeri) in an aquarium

Tetras & rasboras

Emperor tetra

Nematobrycon palmeri

5 cm adult20 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Penguin tetra (Thayeria boehlkei) in an aquarium

Tetras & rasboras

Penguin tetra

Thayeria boehlkei

6 cm adult29 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Diamond tetra (Moenkhausia pittieri) in an aquarium

Tetras & rasboras

Diamond tetra

Moenkhausia pittieri

6 cm adult29 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Rosy tetra (Hyphessobrycon rosaceus) in an aquarium

Tetras & rasboras

Rosy tetra

Hyphessobrycon rosaceus

4 cm adult20 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Silvertip tetra (Hasemania nana) in an aquarium

Tetras & rasboras

Silvertip tetra

Hasemania nana

5 cm adult20 gal minimum

Active; may nip fins in small groups. A practical community profile with adult-size guidance.

View care profile
Red-eye tetra (Moenkhausia sanctaefilomenae) in an aquarium

Tetras & rasboras

Red-eye tetra

Moenkhausia sanctaefilomenae

7 cm adult29 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile
Green neon tetra (Paracheirodon simulans) in an aquarium

Tetras & rasboras

Green neon tetra

Paracheirodon simulans

3 cm adult10 gal minimum

Generally peaceful in a suitable community. Small and shy; use gentle filtration and mature, stable water.

View care profile
Bleeding heart tetra (Hyphessobrycon erythrostigma) in an aquarium

Tetras & rasboras

Bleeding heart tetra

Hyphessobrycon erythrostigma

7 cm adult29 gal minimum

Generally peaceful in a suitable community. A practical community profile with adult-size guidance.

View care profile