Photo: Zikamoi (CC BY 3.0) — via Wikimedia Commons
Splashing Tetra (Copella arnoldi)
The only aquarium fish that leaps clear of the water to lay its eggs on overhanging leaves — a genuine natural spectacle in a small, peaceful package.
Will it live with a Splashing Tetra?
We compare each fish against your splashing tetra on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Banded Dwarf Cichlid✅ CompatibleSemi-aggressive · 7 cm · Medium care · 24–30 °C (75–86 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Betta✅ CompatibleSemi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the top of the tank — offer enough cover so they aren't always in each other's space.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Black Kuhli Loach✅ CompatiblePeaceful · 8 cm · Easy care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 23–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Bolivian Ram✅ CompatiblePeaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
- Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Brilliant Rasbora✅ CompatiblePeaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Brilliant Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Burmese Loach✅ CompatiblePeaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Celebes Rainbowfish✅ CompatiblePeaceful · 7 cm · Medium 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.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Celebes Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Corydoras Catfish✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
- Costa's Tetra✅ CompatiblePeaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Costa's Tetra in a shoal of 6+ or it gets stressed and nippy.
- Croaking Gourami✅ CompatiblePeaceful · 7 cm · Easy care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Gold Barb✅ CompatiblePeaceful · 7.5 cm · Easy care · 18–26 °C (64–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Gold Barb in a shoal of 6+ or it gets stressed and nippy.
- Hongsloi Dwarf Cichlid✅ CompatibleSemi-aggressive · 7 cm · Medium care · 24–29 °C (75–84 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Leopard Frog Pleco✅ CompatiblePeaceful · 9 cm · Medium 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.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Mahachai Betta✅ CompatibleAggressive · 7 cm · Medium care · 24–30 °C (75–86 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the top of the tank — offer enough cover so they aren't always in each other's space.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Peacock Gudgeon✅ CompatiblePeaceful · 7 cm · Medium 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.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Peppered Corydoras✅ CompatiblePeaceful · 7 cm · Easy care · 18–26 °C (64–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Peppered Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Rio Negro Checkerboard Cichlid✅ CompatiblePeaceful · 7 cm · Hard care · 24–29 °C (75–84 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Roundtail Paradise Fish✅ CompatibleSemi-aggressive · 7 cm · Easy care · 10–26 °C (50–79 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Both favour the top of the tank — offer enough cover so they aren't always in each other's space.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Spotfin Corydoras✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Spotfin Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotted Corydoras✅ CompatiblePeaceful · 7 cm · Easy care · 22–27 °C (72–81 °F)
- Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Spotted Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Sterbai Corydoras✅ CompatiblePeaceful · 6.5 cm · Medium care · 24–30 °C (75–86 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Sterbai Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Sumo Loach✅ CompatibleSemi-aggressive · 7 cm · Medium care · 22–26 °C (72–79 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Thick-lipped Gourami✅ CompatiblePeaceful · 9 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.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Umbrella Dwarf Cichlid✅ CompatibleSemi-aggressive · 7 cm · Medium care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- African Butterfly Cichlid⚠️ With cautionSemi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
- African Butterfly Cichlid is semi-aggressive and may chase or nip the smaller Splashing Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Agassiz's Dwarf Cichlid⚠️ With cautionSemi-aggressive · 9 cm · Medium care · 24–30 °C (75–86 °F)
- Agassiz's Dwarf Cichlid and Splashing Tetra are close in size, but the semi-aggressive one tends to dominate — add splashing tetra in a group to spread the pressure.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Amazon Puffer⚠️ With cautionPeaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Amazon Puffer in a shoal of 6+ or it gets stressed and nippy.
- Badis⚠️ With cautionSemi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
- Badis is semi-aggressive and may chase or nip the smaller Splashing Tetra — plant heavily and break up sight lines.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Bamboo Shrimp⚠️ With cautionPeaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
- Adult Bamboo Shrimp might survive with Splashing Tetra, but expect the young to be eaten — plant heavily.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Bandit Cichlid⚠️ With cautionSemi-aggressive · 9 cm · Medium care · 22–26 °C (72–79 °F)
- Bandit Cichlid and Splashing Tetra are close in size, but the semi-aggressive one tends to dominate — add splashing tetra in a group to spread the pressure.
- Your 75 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Bandit Cichlid in a shoal of 6+ or it gets stressed and nippy.
- Brichardi Cichlid⚠️ With cautionSemi-aggressive · 9 cm · Medium care · 24–28 °C (75–82 °F)
- pH preferences only just meet (Splashing Tetra 6–7.5 vs Brichardi Cichlid 7.8–9) — target the overlap and acclimate slowly.
- Expect Brichardi Cichlid to harass Splashing Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Clown Pleco⚠️ With cautionPeaceful · 9 cm · Medium care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Cockatoo Dwarf Cichlid⚠️ With cautionSemi-aggressive · 8 cm · Medium care · 24–28 °C (75–82 °F)
- Cockatoo Dwarf Cichlid is semi-aggressive and may chase or nip the smaller Splashing Tetra — plant heavily and break up sight lines.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Congo Tetra⚠️ With cautionPeaceful · 8 cm · Medium care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Congo Tetra in a shoal of 6+ or it gets stressed and nippy.
- Demasoni Cichlid⚠️ With cautionAggressive · 9 cm · Hard care · 23–27 °C (73–81 °F)
- pH preferences only just meet (Splashing Tetra 6–7.5 vs Demasoni Cichlid 7.8–8.6) — target the overlap and acclimate slowly.
- Demasoni Cichlid and Splashing Tetra are close in size, but the aggressive one tends to dominate — add splashing tetra in a group to spread the pressure.
- Your 75 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Demasoni Cichlid in a shoal of 12+ or it gets stressed and nippy.
- Dwarf Gourami⚠️ With cautionSemi-aggressive · 8 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Dwarf Gourami to harass Splashing Tetra at times; give dense cover and watch them at feeding.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Glass Catfish⚠️ With cautionPeaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Glass Catfish in a shoal of 6+ or it gets stressed and nippy.
- Goldeneye Dwarf Cichlid⚠️ With cautionSemi-aggressive · 8 cm · Easy care · 24–28 °C (75–82 °F)
- Goldeneye Dwarf Cichlid is semi-aggressive and may chase or nip the smaller Splashing Tetra — plant heavily and break up sight lines.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Pantanal Corydoras⚠️ With cautionPeaceful · 8 cm · Medium care · 22–27 °C (72–81 °F)
- Your 75 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Pantanal Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Scissortail Rasbora⚠️ With cautionPeaceful · 8 cm · Easy care · 22–27 °C (72–81 °F)
- Your 75 L tank is below the ~90 L this pairing really wants — crowding raises aggression.
- Keep Splashing Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Scissortail Rasbora 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)
- Size gap is too large (250 vs 8 cm): Alligator Gar will treat Splashing Tetra as food.
- Alligator Gar clearly outsizes Splashing Tetra and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Keep Splashing 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)
- Splashing 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 Splashing 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 Splashing 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)
- Fire Eel (100 cm) is big enough to swallow the 8 cm Splashing Tetra whole.
- Fire Eel clearly outsizes Splashing 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 Splashing 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)
- Splashing Tetra is bite-sized to a 90 cm koi — it will be eaten.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Keep Splashing 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)
- Redtail Catfish (120 cm) is big enough to swallow the 8 cm Splashing Tetra whole.
- Redtail Catfish clearly outsizes Splashing 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 Splashing 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 8 cm Splashing Tetra whole.
- Spotted Gar clearly outsizes Splashing Tetra and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Keep Splashing 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)
- Size gap is too large (300 vs 8 cm): Wels Catfish will treat Splashing Tetra as food.
- Wels Catfish clearly outsizes Splashing Tetra and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Keep Splashing 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)
- Wolf Cichlid (72 cm) is big enough to swallow the 8 cm Splashing Tetra whole.
- Wolf Cichlid is aggressive and may chase or nip the smaller Splashing 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 Splashing 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.
Splashing Tetra care specs
- Care level
- Medium
- Breeding
- Hard
- Max size
- 8 cm (3.1 in)
- Min tank size
- 60 L (15.9 gal)
- Temperature
- 22–28 °C (72–82 °F)
- pH
- 6–7.5
- Hardness
- 2–12 dGH
- Lifespan
- 3–5 years
- Diet
- Omnivore
- Swim level
- Top
- Group size
- 6+ (shoaling)
- Family
- Lebiasinidae
- Origin
- South America — lower Amazon basin, Guyana (slow, vegetated blackwater streams)
What is a Splashing Tetra?
The splashing tetra (Copella arnoldi) is a slender, surface-dwelling fish from the Lebiasinidae family — cousins of the pencilfish rather than true tetras. Males reach up to 8 cm (3 in); females stay noticeably smaller. The body is olive-brown with a faint iridescent blue-green shimmer along the flank, and males develop reddened fin edges and a dramatically elongated upper lobe on the caudal fin that gives them an asymmetric, elegant silhouette. Females are plainer and smaller, making the sexes easy to tell apart at a glance.
What makes this species genuinely remarkable is its breeding behaviour: pairs leap clear of the water together to deposit eggs on leaves or other surfaces above the waterline, and the male then repeatedly splashes his tail against the clutch to keep the eggs moist until they hatch. No other aquarium fish reproduces this way, and witnessing it in a well-planted tank is one of the hobby’s real treats. Care level is rated medium — the water quality requirements and the species’ jumping habit demand attentive husbandry, but day-to-day maintenance is straightforward for an experienced keeper.
Where do Splashing Tetras come from?
The splashing tetra is native to the lower Amazon basin and Guyana in South America, where it inhabits slow-moving, heavily vegetated blackwater streams and forest pools. These environments are characterised by soft, acidic water stained amber-brown by tannins leaching from leaf litter and submerged wood. Overhanging riparian vegetation — grasses, shrubs, broad-leaved plants with leaves hanging over the water — provides both cover and the spawning surfaces the species relies on. Shallow, calm conditions with little current are typical. Understanding this origin is the key to replicating the conditions that keep splashing tetras healthy and willing to breed in captivity.
What Tank Setup and Size do Splashing Tetras Need?
A minimum of 60 litres (16 gal) is needed to house a group of six — the minimum social unit. Because the species is a top-dweller with an active, horizontal swimming style, a tank that is long and shallow serves them better than a tall, deep aquarium. A standard 80–90 cm (32–36 in) footprint gives good results.
The most critical hardware requirement is a tight-fitting lid with no gaps around cables or filter inlets. Splashing tetras jump — deliberately, as part of their breeding biology — and any gap is an escape route. Use a cover glass or a closely fitting cabinet hood.
Decorate with floating plants (frogbit, dwarf water lettuce) and broad-leaved emergent or overhanging species — Amazon swords near the waterline, pothos trailing roots into the water, or large Anubias leaves positioned just above the surface — to replicate natural spawning substrates and provide the top-level cover the fish appreciate. A dark substrate and background reduce stress and bring out the fish’s colours. Gentle filtration (sponge filter or hang-on filter turned to a low flow rate) keeps water clean without creating current that unsettles these calm-water fish. Add driftwood and dried Indian almond leaves to condition the water with gentle tannins.
What Water Parameters do Splashing Tetras Need?
- Temperature: 22–28 °C (72–82 °F). The species tolerates a modest range, but stable mid-range temperatures around 24–26 °C are ideal for long-term health.
- pH: 6.0–7.5. Blackwater conditions on the lower end of that range (pH 6.0–6.8) are preferred and are essential for conditioning the fish to breed.
- Hardness: 2–12 dGH — soft to moderately soft water. Hard tap water should be cut with RO or rainwater if breeding is a goal.
As with any tropical species, stability is more important than perfection. Cycle the tank fully before adding fish, perform weekly partial water changes of 20–25%, and avoid sudden temperature or pH swings. Blackwater chemistry (low pH, low GH) is not strictly necessary for basic keeping but noticeably improves colour and behaviour.
What do Splashing Tetras Eat?
The splashing tetra is an omnivore with a surface-feeding posture; its upturned mouth is adapted to take food at or just below the waterline. In the wild the diet consists largely of small insects, insect larvae, and other invertebrates that fall onto the water surface, supplemented with small crustaceans and plant material.
In captivity, offer a varied diet including:
- Frozen and live small invertebrates — daphnia, brine shrimp (artemia), bloodworms, micro-worms, and mosquito larvae. These are especially valuable for conditioning breeding adults.
- High-quality micro-pellets or crushed flake as a day-to-day staple, chosen for small particle size to suit the fish’s modest mouth.
- Occasional dried insects (daphnia pellets, small midge larvae pellets) for enrichment.
Feed small amounts twice daily. Surface-dwelling fish are prone to overfeeding because uneaten food collects near the surface before sinking; remove any uneaten portions after a few minutes to protect water quality.
What is the Behaviour and Compatibility of Splashing Tetras?
Splashing tetras are peaceful and sociable, showing no aggression toward other species and only mild intraspecific interactions during courtship. They are a shoaling species — keep a minimum of six individuals, ideally with more females than males (a ratio of two females per male reduces breeding harassment). In smaller groups the fish become shy and stay hidden; in a group of six or more they are active, confident, and spend more time in open water.
They are ideal candidates for a soft-water biotope community. Good tank-mates include other peaceful small fish that share their water chemistry preferences: small corydoras species (e.g. C. habrosus, C. pygmaeus) as bottom-dwellers, dwarf cichlids such as apistogrammas or rams in the mid-to-lower zone, and other small South American tetras or pencilfish at mid-water. Avoid fin-nipping species, large boisterous cichlids, or fast-moving surface swimmers that will outcompete the splashing tetra for food and cover.
For a full list of tested compatible and incompatible species, see Splashing Tetra tank mates.
How do you Tell Male from Female Splashing Tetras?
Sexual dimorphism in this species is clear and makes sexing straightforward even in a community tank:
- Males are the larger sex, reaching up to 8 cm (3 in), and display more vivid colouration with red-tinged fins and a stronger iridescent sheen. The defining feature is the strongly elongated upper lobe of the caudal fin, which gives the tail an asymmetric, flag-like appearance that is absent in females.
- Females are smaller and plainer, with a symmetrical, rounded tail and duller, more uniformly olive colouration. They tend to appear more compact and rounder in the belly when gravid.
This clear difference means sexed groups can be purchased with confidence, and a ratio of one male to two females is recommended for a breeding setup to avoid a single female being harassed continuously.
How do Splashing Tetras Breed?
Breeding is rated hard — not because the fish are delicate, but because the process requires a specific setup and active observation, and raising fry successfully adds further complexity.
To trigger spawning, condition adults on a diet of live and frozen foods, maintain soft acidic water (pH 6.0–6.5, hardness 2–5 dGH), and ensure there are broad leaves or other flat surfaces positioned just above the waterline — sturdy Anubias leaves, a sheet of slate or acrylic laid on a foam float, or similar. The male courts the female alongside the surface before the pair launch themselves together, pressing their bodies against the overhanging surface and depositing a small clutch of adhesive eggs. This is repeated several times over an hour or more until a full clutch of 10–100+ eggs is laid.
After spawning the female takes no further role. The male alone guards the clutch, swimming up periodically to splash water from his caudal fin onto the eggs — the behaviour that gives the species its common name. This continues for 24–36 hours until the eggs hatch and the larvae drop into the water below.
Remove the adults after hatching to protect fry. Raise the tiny fry on infusoria, green water, and later micro-worms and freshly hatched brine shrimp nauplii. Water level can be kept low in the grow-out tank to make feeding easier. Growth is slow and mortality in the first few weeks is the main challenge.
What are Common Diseases of Splashing Tetras?
Splashing tetras are not unusually disease-prone, but as a soft-water species they can be sensitive to poor water quality and sudden chemistry changes. The most commonly encountered problems are:
- Ich (white spot disease) — white pinhead spots on the body and fins, caused by Ichthyophthirius multifiliis. Triggered by temperature fluctuations or stress. Preventable with stable temperatures and quarantining new fish.
- Fin rot — ragged or receding fin edges, almost always a symptom of deteriorating water quality. Regular water changes and tank maintenance are the main prevention.
- Velvet (Oodinium) — a dusty gold or rust-coloured sheen on the body. A fast-spreading parasite; quarantine all new arrivals to prevent introduction.
- Bacterial infections and skin lesions — most commonly arise following physical injury (from jumping against a lid) or chronically poor water conditions. Keep water clean and the lid secure.
Prevention follows a short list of principles: a fully cycled, stable tank; weekly water changes; quarantine for all new fish and plants before introduction; and a varied diet to maintain immune resilience.
Health note: disease diagnosis and medication dosing are outside the scope of a care profile. If a fish shows symptoms that do not improve with water-quality correction, consult a veterinary or specialist fish-health source before medicating.
How Long do Splashing Tetras Live?
In well-maintained conditions, splashing tetras live 3–5 years. This is a relatively modest lifespan for a small South American tetra, reflecting the species’ mid-range hardiness. Fish kept in stable soft-water conditions with a varied diet and minimal stress tend to reach the upper end of that range. Suboptimal water chemistry — particularly hard, alkaline water far outside the 2–12 dGH, pH 6.0–7.5 window — shortens lifespan and suppresses colour and breeding behaviour. Because the species is not mass-produced at the scale of common tetras, most fish sold are wild-caught or F1 captive-bred; expect a full lifespan from healthy juveniles purchased from a reputable source.
Frequently asked questions
Why does the splashing tetra jump out of the water?
It is their unique breeding strategy — mating pairs leap together up to 10 cm above the surface to deposit eggs on overhanging leaves, then the male splashes water onto the eggs every few minutes to keep them moist until they hatch. A tight-fitting lid is therefore essential to prevent escape.
Can splashing tetras live with other fish?
Yes — they are gentle, peaceful fish that work well with other small, soft-water species such as dwarf cichlids, small corydoras, and other tetras or rasboras that share their soft, slightly acidic water preference.
What you need to keep a splashing tetra
The baseline is a heated, filtered 60 L+ tank: a reliable heater to hold 22–28 °C (72–82 °F), a gentle filter that won't batter a splashing tetra in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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