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 profileFreshwater fish database
100 common freshwater aquarium fish
Compare adult size, tank space, water range, social needs and temperament before you buy. Every profile uses adult dimensions and explains the trade-offs behind its recommendation.
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Tetras & rasboras
Cardinal tetra
Paracheirodon axelrodi
4.5 cm adult20 gal minimum
Generally peaceful in a suitable community. Prefers warmer water than neons.
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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.
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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.
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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.
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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.
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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.
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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 profileHow to use the database
Start with adult size and minimum tank volume, then check temperature, pH, social group and temperament. A fish that fits the volume can still be a poor match if it needs cooler water, a large school or a different swimming level.
Use the Stocking & Bioload Planner to test a community plan. The planner is an estimate; cycle the aquarium, test ammonia and nitrite, and add fish gradually.