Photo: D. Bork and A. Zarske (CC BY 4.0) — via Wikimedia Commons
Yellow Tetra (Hyphessobrycon bifasciatus)
A hardy, soft-gold schooling tetra from coastal Brazil that thrives in a wide range of water conditions and brightens any community tank.
Will it live with a Yellow Tetra?
We compare each fish against your yellow tetra on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Amano Shrimp✅ CompatiblePeaceful · 5 cm · Easy care · 18–28 °C (64–82 °F)
- Compatible on the things that matter: shared water near 20–25 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Axelrod's Cory✅ CompatiblePeaceful · 5 cm · Easy care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Axelrod's Cory in a shoal of 6+ or it gets stressed and nippy.
- Bandit Corydoras✅ CompatiblePeaceful · 5 cm · Easy care · 22–27 °C (72–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Bandit Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Black Phantom Tetra✅ CompatiblePeaceful · 4.5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Phantom Tetra in a shoal of 6+ or it gets stressed and nippy.
- Blue Turbo Snail✅ CompatiblePeaceful · 5 cm · Medium care · 25–30 °C (77–86 °F)
- Compatible on the things that matter: shared water near 25–25 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Checkered Barb✅ CompatiblePeaceful · 5 cm · Easy care · 20–25 °C (68–77 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Checkered Barb in a shoal of 6+ or it gets stressed and nippy.
- Cherry Barb✅ CompatiblePeaceful · 5 cm · Easy care · 23–27 °C (73–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Cherry Barb in a shoal of 6+ or it gets stressed and nippy.
- Chocolate Gourami✅ CompatiblePeaceful · 5 cm · Hard care · 25–30 °C (77–86 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Chocolate Gourami in a shoal of 6+ or it gets stressed and nippy.
- Cochu's Blue Tetra✅ CompatiblePeaceful · 5 cm · Medium care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Cochu's Blue Tetra in a shoal of 8+ or it gets stressed and nippy.
- Firehead Tetra✅ CompatiblePeaceful · 5 cm · Medium care · 24–28 °C (75–82 °F)
- Both are peaceful, and their water overlaps around 24–25 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Firehead Tetra in a shoal of 8+ or it gets stressed and nippy.
- Five-banded Barb✅ CompatiblePeaceful · 5 cm · Easy care · 23–27 °C (73–81 °F)
- Compatible on the things that matter: shared water near 23–25 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Five-banded Barb in a shoal of 6+ or it gets stressed and nippy.
- Forktail Blue-eye✅ CompatiblePeaceful · 5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Forktail Blue-eye in a shoal of 6+ or it gets stressed and nippy.
- Gold Tetra✅ CompatiblePeaceful · 4.5 cm · Easy care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–25 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Gold Tetra in a shoal of 6+ or it gets stressed and nippy.
- Half-striped Penguin Tetra✅ CompatiblePeaceful · 5 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Half-striped Penguin Tetra in a shoal of 6+ or it gets stressed and nippy.
- Harlequin Rasbora✅ CompatiblePeaceful · 5 cm · Easy care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–25 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Harlequin Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Honey Gourami✅ CompatiblePeaceful · 5 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–25 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Horseman Cory✅ CompatiblePeaceful · 5 cm · Medium care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Horseman Cory in a shoal of 6+ or it gets stressed and nippy.
- Japanese Trapdoor Snail✅ CompatiblePeaceful · 5 cm · Easy care · 10–28 °C (50–82 °F)
- Both are peaceful, and their water overlaps around 20–25 °C — no size, zone or temperament conflicts.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Julii Corydoras✅ CompatiblePeaceful · 5 cm · Easy care · 23–26 °C (73–79 °F)
- Both are peaceful, and their water overlaps around 23–25 °C — no size, zone or temperament conflicts.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Julii Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Lemon Tetra✅ CompatiblePeaceful · 4.5 cm · Easy care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 23–25 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Lemon Tetra in a shoal of 6+ or it gets stressed and nippy.
- Masked Corydoras✅ CompatiblePeaceful · 5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Masked Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Mystery Snail✅ CompatiblePeaceful · 5 cm · Easy care · 20–28 °C (68–82 °F)
- Compatible on the things that matter: shared water near 20–25 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Panda Corydoras✅ CompatiblePeaceful · 5 cm · Medium care · 20–26 °C (68–79 °F)
- Both are peaceful, and their water overlaps around 20–25 °C — no size, zone or temperament conflicts.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Panda Corydoras in a shoal of 6+ or it gets stressed and nippy.
- X-ray Tetra✅ CompatiblePeaceful · 4.5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep X-ray Tetra in a shoal of 6+ or it gets stressed and nippy.
- Black Ruby Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Black Ruby Barb and Yellow Tetra are close in size, but the semi-aggressive one tends to dominate — add yellow tetra in a group to spread the pressure.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
- Black Skirt Tetra⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Expect Black Skirt Tetra to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Skirt Tetra in a shoal of 6+ or it gets stressed and nippy.
- Desert Goby⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °F)
- Expect Desert Goby to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Dwarf Chain Loach⚠️ With cautionPeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
- Eastern Betta⚠️ With cautionSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Eastern Betta is semi-aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Fire Red Licorice Gourami⚠️ With cautionPeaceful · 3.5 cm · Hard care · 23–28 °C (73–82 °F)
- One likes softer water and the other harder (5–20 vs 0–4 dGH) — a compromise, not a perfect match.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Ghost Shrimp⚠️ With cautionPeaceful · 4 cm · Easy care · 18–28 °C (64–82 °F)
- Adult Ghost Shrimp might survive with Yellow Tetra, but expect the young to be eaten — plant heavily.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Ghost Shrimp in a shoal of 6+ or it gets stressed and nippy.
- GloFish Tetra⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 21–28 °C (70–82 °F)
- Expect GloFish Tetra to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep GloFish Tetra in a shoal of 6+ or it gets stressed and nippy.
- Humpbacked Tetra⚠️ With cautionSemi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Expect Humpbacked Tetra to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Humpbacked Tetra in a shoal of 8+ or it gets stressed and nippy.
- Morse Code Corydoras⚠️ With cautionPeaceful · 5 cm · Medium care · 23–26 °C (73–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Odessa Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Odessa Barb is semi-aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Odessa Barb in a shoal of 6+ or it gets stressed and nippy.
- Peaceful Betta⚠️ With cautionSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Peaceful Betta to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Silvertip Tetra⚠️ With cautionSemi-aggressive · 5 cm · Easy care · 22–28 °C (72–82 °F)
- Expect Silvertip Tetra to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Silvertip Tetra in a shoal of 6+ or it gets stressed and nippy.
- Spotfin Betta⚠️ With cautionSemi-aggressive · 5 cm · Medium care · 23–28 °C (73–82 °F)
- Expect Spotfin Betta to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Striped Red-Eye Puffer⚠️ With cautionAggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Striped Red-Eye Puffer is aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Wine Red Betta⚠️ With cautionAggressive · 5 cm · Medium care · 24–28 °C (75–82 °F)
- Water hardness preferences differ (Yellow Tetra 5–20 vs Wine Red Betta 0–4 dGH).
- Wine Red Betta and Yellow Tetra are close in size, but the aggressive one tends to dominate — add yellow tetra in a group to spread the pressure.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Yellow Tetra is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Alligator Gar is aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Yellow Tetra is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
- Clown Knifefish is aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Yellow Tetra is bite-sized to a 100 cm predatory fire eel — it will be eaten.
- Fire Eel clearly outsizes Yellow Tetra and is semi-aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Size gap is too large (90 vs 4.5 cm): Koi will treat Yellow Tetra as food.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Yellow Tetra is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
- Redtail Catfish clearly outsizes Yellow Tetra and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Spotted Gar (90 cm) is big enough to swallow the 4.5 cm Yellow Tetra whole.
- Expect Spotted Gar to harass Yellow Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Wels Catfish (300 cm) is big enough to swallow the 4.5 cm Yellow Tetra whole.
- Wels Catfish is aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Size gap is too large (72 vs 4.5 cm): Wolf Cichlid will treat Yellow Tetra as food.
- Wolf Cichlid is aggressive and may chase or nip the smaller Yellow Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
- Keep Yellow Tetra in a shoal of 6+ or it gets stressed and nippy.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Yellow Tetra care specs
- Care level
- Easy
- Breeding
- Medium
- Max size
- 4.5 cm (1.8 in)
- Min tank size
- 57 L (15.1 gal)
- Temperature
- 20–25 °C (68–77 °F)
- pH
- 5.8–8
- Hardness
- 5–20 dGH
- Lifespan
- 3–5 years
- Diet
- Omnivore
- Swim level
- Middle
- Group size
- 6+ (shoaling)
- Family
- Characidae
- Origin
- Coastal river systems of southeastern Brazil (São Paulo and Paraná states)
What is a Yellow Tetra?
The yellow tetra (Hyphessobrycon bifasciatus) is a small, peaceful Characid native to the coastal river systems of southeastern Brazil — specifically the river drainages of São Paulo and Paraná states. Growing to around 4.5 cm (1.8 in), it has a translucent, pale yellow-gold body marked by two dark spots at the shoulder — the “bifasciatus” (two-banded) of its scientific name — plus a subtle lateral stripe that catches the light beautifully in a well-planted tank. It is one of the more underrated tetras in the hobby: hardier than many relatives, tolerant of a remarkably wide pH range, and genuinely straightforward to keep. A school of six or more moving through mid-water gives any community aquarium a natural, lively quality without demanding specialist conditions.
Where do Yellow Tetras come from?
Wild yellow tetras come from the coastal river systems of southeastern Brazil, concentrated in the lowland waters of São Paulo and Paraná states. These rivers are slow to moderately flowing, shaded by riparian vegetation, with warm temperatures, soft-to-moderately-hard water, and substrates of dark sand or mud with heavy leaf litter. The fish occupy the middle column, feeding on small invertebrates and plant matter drifting through the current. That origin explains why they look their best in a planted tank with a dark substrate and gentle flow — conditions that approximate the dappled shallows of their native habitat.
What tank size and setup do Yellow Tetras need?
A minimum of 57 litres (15 gallons) is recommended for a school of six, and a longer tank footprint is better than a tall one — yellow tetras are active, horizontal mid-water swimmers. Dark substrate (fine black sand or dark gravel) brings out the warm gold of their bodies far more effectively than pale gravel. Dense planting along the sides and back, with open water in the centre for schooling, closely mirrors their natural habitat and keeps them confident and active.
Lighting can be moderate; very bright tanks tend to wash out the delicate yellow tones. A gentle filter output is preferred — these are not fast-river fish and a strong current stresses them. Driftwood and leaf litter are optional but beneficial, leaching tannins that soften and slightly acidify the water, which suits this species well. Keep a tight-fitting lid: like most tetras, yellow tetras will jump if startled.
What water parameters do Yellow Tetras need?
- Temperature: 20–25 °C (68–77 °F)
- pH: 5.8–8.0 — an unusually wide tolerance that suits both soft, acidic South American setups and harder, neutral community tanks
- Hardness: 5–20 dGH
This breadth of tolerance is one of the yellow tetra’s genuine strengths. Many tetra species are fussy about soft, acidic water; the yellow tetra adapts to a broad range of tap-water conditions without issue. That said, stability always matters more than chasing the “ideal” number — steady parameters, a properly cycled tank, and regular water changes of 25–30% per week will keep this fish in excellent condition across almost any reasonable parameter set.
What do Yellow Tetras eat?
Yellow tetras are omnivores and easy to feed. A quality micro-pellet or small tropical flake serves as a reliable staple. Supplement this regularly with frozen or live foods — daphnia, brine shrimp, micro-worms and small bloodworms are all accepted eagerly and help maintain good colouration and reproductive condition. Like most small schooling fish, they do best with two small feedings per day rather than one large one, eating only what they can consume in two to three minutes. Variety in the diet keeps colour rich; fish fed only dry food for extended periods tend to look pale and dull.
Are Yellow Tetras peaceful — and what fish can they live with?
Yellow tetras are peaceful community fish with one important caveat: they need to be kept in a proper school. In groups of six or more they are relaxed, confident and well-behaved. In smaller groups they can become nippy toward slow, long-finned tankmates — so keep the school large and choose companions with similar energy and fin shape.
Good tankmates are other South American community fish of similar size and temperament: cardinal tetras, rummy-nose tetras, harlequin rasboras, small corydoras species, and peaceful dwarf cichlids such as apistogrammas all work well. Avoid slow-moving, fancy-finned fish like bettas or angelfish, and steer clear of anything large enough to eat a 4.5 cm tetra. Peaceful bottom-dwellers round out a community nicely, since yellow tetras occupy the middle column and leave the floor largely to others.
For a full, filterable list of compatible species, see Yellow Tetra tank mates.
How do you tell male from female Yellow Tetras?
Sexual dimorphism in yellow tetras is subtle but consistent. Females are plumper through the belly — noticeably so when gravid — and are marginally larger overall. Males are slimmer and more streamlined, with a more intense yellow flush that deepens during spawning condition and courtship. Outside of breeding readiness, the difference can be modest, and juveniles are very difficult to sex reliably. The clearest view is from above: a ripe female looks distinctly rounder than any male of the same age.
How do Yellow Tetras breed?
Yellow tetras are egg-scatterers and can be bred in a dedicated spawning tank, which rates as medium difficulty. Set up a small tank (20–30 L / 5–8 gal) with very soft, slightly acidic water (pH around 6.0–6.5), a spawning mop or fine-leaved plants like Java moss, and dim lighting. Condition a pair or a small group of two males and one female on live and frozen foods for a week or two before introducing them to the breeding tank.
Spawning typically occurs in the early morning. The pair scatters eggs among the plants; adults will eat their own eggs if left in the tank, so remove them promptly after spawning. Eggs hatch in 24–36 hours depending on temperature. Feed fry infusoria or liquid fry food for the first week, then micro-worms and baby brine shrimp as they grow. Maintain excellent water quality throughout — fry are sensitive to ammonia spikes.
What diseases do Yellow Tetras commonly get?
Yellow tetras are hardy fish and rarely fall ill in a well-maintained tank. The most common issues are:
- Ich (white spot): Small white dots on fins and body, typically triggered by a temperature drop or introduction of unquarantined fish. Raise temperature gradually and treat early.
- Fin rot: Ragged or receding fin edges, almost always a consequence of poor water quality. Improve filtration and water-change frequency; the fins usually recover once conditions improve.
- Velvet: A fine, dusty gold or rust-coloured coating, often seen on fish stressed by temperature instability. Dim the lights and address the root cause.
- Internal parasites: Thin, hollow-bellied fish that eat well but don’t gain weight may have internal worms — common in wild-caught stock.
Prevention is straightforward: keep the tank cycled and stable, quarantine all new fish for two to four weeks before adding them to the community, avoid sudden temperature swings, and feed a varied diet without overfeeding.
Health note: disease diagnosis and medication dosing are beyond the scope of a care profile. For a sick fish, confirm symptoms against a reliable veterinary or fish-health source before medicating.
How long do Yellow Tetras live?
With good care, yellow tetras live 3–5 years. This is a typical lifespan for small schooling Characids and is achievable in a home aquarium with stable water, a nutritious and varied diet, and the social environment of a proper school. Fish kept in cramped conditions, poor water quality or in undersized groups tend to live significantly shorter lives. Buy juveniles when possible to get the most out of their lifespan, and keep the group topped up as individuals age to maintain the social dynamic the species depends on.
Frequently asked questions
How many yellow tetras should I keep together?
Keep at least six — they are a schooling species and show their best colour and most relaxed behaviour in a proper group. A larger school of ten or more is even better in a spacious tank.
Are yellow tetras fin-nippers?
They can occasionally nip at very slow-moving or long-finned fish if kept in too small a group. Keeping them in a school of six or more and avoiding slow, fancy-finned tank-mates (like bettas or angelfish) eliminates most nipping behaviour.
What you need to keep a yellow tetra
The baseline is a heated, filtered 57 L+ tank: a reliable heater to hold 20–25 °C (68–77 °F), a gentle filter that won't batter a yellow tetra in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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