Freshwater Tetras
Dazzling dwarves - add brilliant schooling colour to your community aquarium with our range of tetras.
Tetras are a widely loved freshwater aquarium fish belonging to the characin family, with more than 150 recognised species. Suitable for new and experienced keepers, a small community tropical fish tank is rarely complete without a lively shoal of these hardy, attractive fish.
Most tetra species remain small, with common varieties reaching up to 7.5 cm (3 inches) while many stay around 3.8 cm (1.5 inches). They typically live for 6–8 years in well-maintained aquariums. Their iridescent scales, streamlined bodies and bright colour highlights make them a standout choice for planted community tanks.
Tetra Care
Tetras are generally low-maintenance fish capable of adapting to varied water conditions. They can, however, be vulnerable to disease if water quality is neglected, so regular monitoring for ammonia and nitrate is essential. Quarantine new fish before adding them to an established aquarium. The ever-popular Neon tetra is one of the most recognisable fish in the hobby. Other excellent choices include the Black Neon tetra, Diamond tetra, Rummynose tetra and the rounded Golden Black Widow tetra.
Tetras Natural Habitat
Most tetras originate from South America, particularly the Amazon basin, though many species also occur in Central America and parts of western Africa. Notably, the Blind Cave tetra inhabits Mexican cenotes. In the wild, tetras typically occupy cool, flowing freshwater streams but also inhabit ponds, floodplains and tannin-rich forest waters.
Behaviour and Compatibility for Tetras
The vast majority of tetras are peaceful, confident fish, though exceptions exist. The uncommon Bucktooth tetra is highly aggressive and unsuitable for community tanks. Black Widow tetras may nip the fins of species such as Angelfish. Most popular tetras – including the Green Neon, Golden Neon, Cardinal tetra and classic Neon tetra - are excellent community fish. Tetras must be kept in shoals, with a recommended minimum of 10 individuals. Suitable tank mates include Swordtails, Corydoras, Guppies, Rasboras and Danios.
Tetra Fish Tank Set-up Tips
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Tank
Although individual tetras are small, their schooling nature requires adequate space. A minimum group of 10 is recommended. They prefer lower lighting and gentle water movement, and a lid is advisable as they may jump. The following guidelines apply to smaller species such as Neon tetras, Cardinal tetras and Fire-ember tetras. Always check specific requirements for each species.
| Recommended Max Fish Count |
Tank Volume |
| 10 Tetras |
39 litres (10 gallons) |
| 15 Tetras |
47 litres (12.5 gallons) |
| 20 Tetras |
57 litres (15 gallons) |
| 30 Tetras |
72 litres (19 gallons) |
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Base
Tetras spend most of their time mid-water, so the type of substrate is not critical. A darker base is recommended as it enhances plant growth and improves colour contrast.
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Foliage
A well-planted freshwater aquarium is ideal. Bunching plants provide useful shade and cover. Popular choices include Java Fern, Pennywort and Ludwigia. Adding driftwood also helps create natural shaded areas that accentuate their colours.
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Water
Tetras prefer cooler, softer, slightly acidic water. Maintain temperatures between 20-28°C (68-82.4°F). Depending on your location, a water heater may be required. pH should remain between 5.5 and 7.5, with hardness between 5-15 dGH. To ensure accuracy, invest in a testing kit. Regular water changes are essential: 25% weekly or 50% fortnightly. Tap water should be treated using appropriate water conditioners.
Feeding and Care
Tetras are primarily carnivorous, though they appreciate some plant-based foods. High-quality prepared tropical fish foods such as flakes and slow-sinking pellets work well. Supplement their diet with live or frozen foods like bloodworms, brine shrimp and daphnia. Vegetables such as peas, broccoli and cabbage can be offered if finely blended so they can be eaten easily.
Great Reasons to Keep Tetras in Your Tropical Fish Tank
- Tetras are peaceful fish that get along well with other friendly, similarly sized species.
- A shoal of tetras brings colour, movement and character to any tropical aquarium.
- They are straightforward to care for and offer years of enjoyment when maintained well.
Tetras remain one of the most loved fish families in the aquarium hobby. Browse our online tropical fish store below and explore the varieties currently available. Popular choices include packs of Mixed Neon Tetras, Classic Neon Tetras, Phantom Tetras and standout species like the Purple Pencilfish or Dark Marble Hatchet Fish.
