Photo: Karl Heinz Lüling (CC BY-SA 4.0) — via Wikimedia Commons
Dawn Tetra (Aphyocharax nattereri)
A sparkling, inch-long schooling tetra with a crisply contrasted black-and-white anal fin — perfect for nano and planted community tanks.
Will it live with a Dawn Tetra?
We compare each fish against your dawn tetra on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Assassin Snail✅ CompatiblePeaceful · 3 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Celestial Pearl Danio✅ CompatiblePeaceful · 2 cm · Medium care · 22–26 °C (72–79 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Cherry Shrimp✅ CompatiblePeaceful · 3 cm · Easy care · 18–28 °C (64–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Cherry Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Chili Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Chili Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Crystal Red Shrimp✅ CompatiblePeaceful · 2.5 cm · Hard care · 20–24 °C (68–75 °F)
- Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Crystal Red Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Dwarf Spotted Rasbora✅ CompatiblePeaceful · 2.5 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Dwarf Spotted Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Ember Tetra✅ CompatiblePeaceful · 2 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 middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Ember Tetra in a shoal of 8+ or it gets stressed and nippy.
- Emerald Dwarf Danio✅ CompatiblePeaceful · 2 cm · Medium care · 20–24 °C (68–75 °F)
- Compatible on the things that matter: shared water near 22–24 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Emerald Dwarf Danio in a shoal of 8+ or it gets stressed and nippy.
- Endler's Livebearer✅ CompatiblePeaceful · 3 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Endler's Livebearer in a shoal of 6+ or it gets stressed and nippy.
- Exclamation Point Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Exclamation Point Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Glowlight Danio✅ CompatiblePeaceful · 3 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.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Gold Ring Danio✅ CompatiblePeaceful · 3 cm · Easy care · 18–26 °C (64–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Gold Ring Danio in a shoal of 8+ or it gets stressed and nippy.
- Green Neon Tetra✅ CompatiblePeaceful · 2.5 cm · Hard 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 middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Green Neon Tetra in a shoal of 8+ or it gets stressed and nippy.
- Lambchop Rasbora✅ CompatiblePeaceful · 3 cm · Medium 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.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Lambchop Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Malaysian Trumpet Snail✅ CompatiblePeaceful · 3 cm · Easy care · 21–27 °C (70–81 °F)
- Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Neon Blue Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–26 °C (73–79 °F)
- Compatible on the things that matter: shared water near 23–26 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Neon Blue Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Neon Green Rasbora✅ CompatiblePeaceful · 2 cm · Easy care · 22–26 °C (72–79 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Neon Green Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Neon Tetra✅ CompatiblePeaceful · 3 cm · Easy care · 20–26 °C (68–79 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Neon Tetra in a shoal of 6+ or it gets stressed and nippy.
- Nerite Snail✅ CompatiblePeaceful · 2.5 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Ramshorn Snail✅ CompatiblePeaceful · 2 cm · Easy care · 20–28 °C (68–82 °F)
- Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Red Lip Nerite Snail✅ CompatiblePeaceful · 2 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Tail-spot Corydoras✅ CompatiblePeaceful · 3 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Tail-spot Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Tiger Shrimp✅ CompatiblePeaceful · 3 cm · Hard care · 20–25 °C (68–77 °F)
- Compatible on the things that matter: shared water near 22–25 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Tiger Shrimp in a shoal of 6+ or it gets stressed and nippy.
- Trinidad Guppy✅ CompatiblePeaceful · 3 cm · Easy care · 19–24 °C (66–75 °F)
- Compatible on the things that matter: shared water near 22–24 °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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Black Darter Tetra⚠️ With cautionSemi-aggressive · 4 cm · Hard care · 21–28 °C (70–82 °F)
- Expect Black Darter Tetra to harass Dawn Tetra at times; give dense cover and watch them at feeding.
- Watch for Black Darter Tetra picking off any dawn tetra small enough to fit in its mouth.
- Keep Dawn Tetra in a shoal of 8+ 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 is semi-aggressive and may chase or nip the smaller Dawn Tetra — plant heavily and break up sight lines.
- Black Ruby Barb may hunt Dawn Tetra, fry or shrimplets — safest in a heavily planted tank.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ 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)
- Black Skirt Tetra clearly outsizes Dawn Tetra and is semi-aggressive; risky unless the tank is big and well-planted.
- Watch for Black Skirt Tetra picking off any dawn tetra small enough to fit in its mouth.
- Keep Dawn Tetra in a shoal of 8+ 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)
- Desert Goby clearly outsizes Dawn Tetra and is semi-aggressive; risky unless the tank is big and well-planted.
- Desert Goby may hunt Dawn Tetra, fry or shrimplets — safest in a heavily planted tank.
- Keep Dawn Tetra in a shoal of 8+ 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 Dawn Tetra in a shoal of 8+ 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 Dawn Tetra — plant heavily and break up sight lines.
- Dawn Tetra is small enough to tempt Eastern Betta; only risk it in a densely planted setup with hiding spots.
- Keep Dawn Tetra in a shoal of 8+ 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 Dawn Tetra at times; give dense cover and watch them at feeding.
- Humpbacked Tetra may hunt Dawn Tetra, fry or shrimplets — safest in a heavily planted tank.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Pea Puffer⚠️ With cautionSemi-aggressive · 2.5 cm · Medium care · 24–28 °C (75–82 °F)
- Pea Puffer and Dawn Tetra are close in size, but the semi-aggressive one tends to dominate — add dawn tetra in a group to spread the pressure.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Rainbow Emperor Tetra⚠️ With cautionSemi-aggressive · 3.6 cm · Medium care · 22–28 °C (72–82 °F)
- Rainbow Emperor Tetra and Dawn Tetra are close in size, but the semi-aggressive one tends to dominate — add dawn tetra in a group to spread the pressure.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
- Serpae Tetra⚠️ With cautionSemi-aggressive · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Expect Serpae Tetra to harass Dawn Tetra at times; give dense cover and watch them at feeding.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Keep Serpae 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)
- Silvertip Tetra is semi-aggressive and may chase or nip the smaller Dawn Tetra — plant heavily and break up sight lines.
- Watch for Silvertip Tetra picking off any dawn tetra small enough to fit in its mouth.
- Keep Dawn Tetra in a shoal of 8+ 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)
- Spotfin Betta clearly outsizes Dawn Tetra and is semi-aggressive; risky unless the tank is big and well-planted.
- Dawn Tetra is small enough to tempt Spotfin Betta; only risk it in a densely planted setup with hiding spots.
- Keep Dawn Tetra in a shoal of 8+ 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 Dawn Tetra — plant heavily and break up sight lines.
- Watch for Striped Red-Eye Puffer picking off any dawn tetra small enough to fit in its mouth.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Tiger Badis⚠️ With cautionSemi-aggressive · 4 cm · Medium care · 22–24 °C (72–75 °F)
- Tiger Badis is semi-aggressive and may chase or nip the smaller Dawn Tetra — plant heavily and break up sight lines.
- Watch for Tiger Badis picking off any dawn tetra small enough to fit in its mouth.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Wine Red Betta⚠️ With cautionAggressive · 5 cm · Medium care · 24–28 °C (75–82 °F)
- Wine Red Betta is aggressive and may chase or nip the smaller Dawn Tetra — plant heavily and break up sight lines.
- Watch for Wine Red Betta picking off any dawn tetra small enough to fit in its mouth.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Alligator Gar (250 cm) is big enough to swallow the 2.5 cm Dawn Tetra whole.
- Alligator Gar clearly outsizes Dawn 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 Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Dawn Tetra is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
- Clown Knifefish clearly outsizes Dawn Tetra and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Size gap is too large (100 vs 2.5 cm): Fire Eel will treat Dawn Tetra as food.
- Expect Fire Eel to harass Dawn Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Koi (90 cm) is big enough to swallow the 2.5 cm Dawn Tetra whole.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ 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 2.5 cm Dawn Tetra whole.
- Expect Redtail Catfish to harass Dawn Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Size gap is too large (90 vs 2.5 cm): Spotted Gar will treat Dawn Tetra as food.
- Spotted Gar is aggressive and may chase or nip the smaller Dawn Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ 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 2.5 cm Dawn Tetra whole.
- Expect Wels Catfish to harass Dawn Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ 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 2.5 cm): Wolf Cichlid will treat Dawn Tetra as food.
- Expect Wolf Cichlid to harass Dawn Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
- Keep Dawn Tetra in a shoal of 8+ 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.
Dawn Tetra care specs
- Care level
- Easy
- Breeding
- Hard
- Max size
- 2.5 cm (1 in)
- Min tank size
- 60 L (15.9 gal)
- Temperature
- 22–28 °C (72–82 °F)
- pH
- 6–7.5
- Hardness
- 2–15 dGH
- Lifespan
- 3–5 years
- Diet
- Carnivore
- Swim level
- Middle
- Group size
- 8+ (shoaling)
- Family
- Characidae
- Origin
- South America — Paraguay River basin (Paraguay, southern Brazil, northern Argentina)
What is a Dawn Tetra?
The Dawn Tetra (Aphyocharax nattereri), also sold under the names Panda Tetra and the older synonym Aphyocharax paraguayensis, is a diminutive but visually striking characin from South America. Topping out at just 2.5 cm (1 in), it sits firmly in nano-fish territory, yet its markings are far bolder than its size suggests: a bright silver body is punctuated by a sharply defined black spot at the base of the tail and a crisp black-and-white banded anal fin that flashes as the school wheels and turns. In a well-planted aquarium with a dark substrate and soft lighting, a healthy group of a dozen or more is genuinely eye-catching.
Despite the carnivore classification in the quick-facts — accurate for their wild diet of small invertebrates — Dawn Tetras are unfussy feeders in captivity and adapt readily to quality micro-pellets and flake. Their peaceful temperament, small footprint and tolerance of a wide temperature range make them one of the more versatile choices for soft-to-neutral community tanks. Keep the hood on: like most small tetras they are capable and enthusiastic jumpers.
Where do Dawn Tetras come from?
Dawn Tetras are native to the Paraguay River basin, with a distribution that spans Paraguay, southern Brazil and northern Argentina. This drainage covers a broad range of lowland habitats: slow-moving tributaries, floodplain pools and seasonally inundated areas shaded by riparian vegetation.
The water in these environments is typically soft and slightly acidic to neutral, warmed by the South American sun but not to the extremes of more tropical zones — hence the species’ comfortable range of 22–28 °C (72–82 °F). Natural cover is provided by submerged vegetation, leaf litter and overhanging plants rather than structured rocky terrain, which explains the species’ preference for planted aquariums with subdued lighting and gentle flow.
What size tank does a Dawn Tetra need?
The minimum recommended tank size is 60 litres (16 gal), which gives a group of eight the horizontal swimming space they need. Dawn Tetras occupy the middle of the water column and are active, schooling fish — length matters more than height. A tank footprint of at least 60 cm (24 in) allows the school to move cohesively rather than circling in a cramped loop.
In practice, 80–100 litres (21–26 gal) with a length of 75–90 cm (30–36 in) provides a noticeably better display and easier water management. Furnish the tank with groups of fine-leaved stem plants (Rotala, Ludwigia, Myriophyllum) and floating plants to diffuse overhead light; leave an open midwater swimming lane. A dark substrate — fine black sand or dark gravel — intensifies the silver-and-black colouration. Filter with a sponge filter or a canister with a spray-bar output; the species dislikes strong turbulence.
What water parameters do Dawn Tetras need?
- Temperature: 22–28 °C (72–82 °F). The cooler end suits unheated or lightly heated tanks in temperate climates; the warmer end suits tropical community setups.
- pH: 6.0–7.5. Soft to neutral is ideal; hard alkaline water is not suitable.
- Hardness: 2–15 dGH. They tolerate moderate hardness but thrive and breed most readily in softer water.
Stability is more important than hitting precise targets. A cycled, regularly maintained tank with weekly partial water changes of 20–30% keeps the parameters steady and keeps the fish healthy. Avoid large, abrupt changes; small tetras are more sensitive to sudden shifts than larger fish.
What do Dawn Tetras eat?
Dawn Tetras are carnivores — in the wild they feed on small invertebrates, zooplankton and insect larvae near the surface and in open water. In an aquarium they accept a wide variety of prepared foods without difficulty, which is part of what makes them straightforward to keep:
- Staple: High-quality micro-pellets or crushed nano flake suitable for fish under 3 cm.
- Enrichment: Frozen or live daphnia, brine shrimp nauplii, micro-worm, vinegar eels and baby brine shrimp all eagerly accepted.
- Frequency: Two small feedings per day. Feed only what the fish consume within two to three minutes; uneaten food fouls soft-water tanks quickly.
Variety in the diet maintains colouration and reproductive condition. Fish fed exclusively on dry food tend to be less vibrant and less willing to breed than those receiving regular live or frozen items.
Are Dawn Tetras peaceful — and what fish can live with them?
Dawn Tetras are genuinely peaceful and pose no threat to any fish they cannot fit in their mouth — which, at 2.5 cm, is effectively nothing. Their only protection requirement is being kept with species that are equally non-aggressive and similarly sized; anything large enough to view them as food is a problem.
Ideal tank-mates include other small, peaceful characins (Ember Tetras, Neon Tetras, Rummy-nose Tetras), dwarf Corydoras species, Otocinclus, small Rasboras and peaceful dwarf cichlids such as Apistogramma and Mikrogeophagus ramirezi, provided the water chemistry suits everyone. Avoid fin-nippers (Tiger Barbs, Serpae Tetras), boisterous medium-sized fish and anything that prefers hard, alkaline water — the chemistry mismatch matters as much as the behaviour.
Because they are small and fast-moving, they rarely suffer fin damage even in mixed-species tanks, but their own long-term welfare depends on being in a group of at least eight; fewer than that and they become stressed, pale and reclusive. Twelve or more is better.
For a full list of tested pairings, see Dawn Tetra tank mates.
How do you tell male from female Dawn Tetras?
Sexual dimorphism in Dawn Tetras is subtle, which is one reason captive breeding is rated hard — sexing the fish accurately enough to form pairs takes careful observation.
- Females become noticeably fuller-bodied, particularly in the belly region, when they are in breeding condition. From above, a ripe female has a distinctly rounded abdomen.
- Males are slightly slimmer throughout and typically remain so regardless of feeding condition.
Outside of active breeding condition the difference is minimal, and young fish are essentially indistinguishable. The safest approach when purchasing is to buy a group of ten or more and allow natural pairing; keeping the group well-fed on varied live and frozen foods encourages females to come into condition.
Can Dawn Tetras be bred in captivity?
Breeding Dawn Tetras is possible but earns its Hard rating. They are egg-scatterers with no parental care — eggs and fry will be eaten by adults if not protected. A dedicated breeding setup is strongly recommended:
- A small, dimly lit breeding tank of 20–30 litres (5–8 gal) with a layer of fine-leaved plants (Java moss, spawning mops) or a mesh grid above the bottom that lets eggs fall through.
- Condition a small group or a selected pair on live and frozen foods for one to two weeks before introducing them.
- Spawning typically occurs in the morning, scattered among plants. Remove adults promptly once spawning is observed.
- Eggs hatch in approximately 24–36 hours at 26 °C (79 °F); fry become free-swimming a few days later.
- First foods must be infusoria or commercial liquid fry food, transitioning to baby brine shrimp nauplii as the fry grow.
Water quality in the fry tank is critical — small water changes daily prevent ammonia build-up without chilling or shocking the fragile fry.
What diseases affect Dawn Tetras?
Dawn Tetras are hardy under good conditions but share the common disease vulnerabilities of small soft-water characins:
- Ich (white spot): The most common aquarium disease; small white spots on fins and body. Caused almost always by temperature stress or chilling from a cold water change.
- Velvet (Oodinium): A fine gold or rust-coloured dusting on the body, most visible under a raking light. Often introduced with new fish.
- Neon Tetra Disease (Pleistophora hyphessobryconis): A microsporidian infection causing colour loss and wasting, incurable and contagious. Quarantine all new fish to prevent introduction.
- Fin rot and bacterial infections: Rare in clean water, common in tanks with high organic load or unstable parameters.
Prevention is far more effective than treatment for a species this small. A 4-week quarantine for all new fish, consistent water changes, stable temperature and avoiding overcrowding eliminate the vast majority of disease risk.
Health note: medication dosing and disease diagnosis are beyond the scope of a care profile. For sick fish, confirm symptoms against a reputable veterinary or fish-health source and treat the underlying water-quality cause before reaching for medication.
How long do Dawn Tetras live?
Dawn Tetras live 3–5 years under good aquarium conditions. Achieving the upper end of that range depends on stable, clean water, a varied diet and the security of a large enough group — a lone or undersized group of Dawn Tetras is a chronically stressed fish, and stress shortens lifespan as reliably in tetras as in any other animal.
Fish purchased as juveniles from a healthy source have the best chance of reaching 4–5 years. Provide them with a planted tank, appropriate water chemistry and a school of at least eight, and this easily-kept species will reward the modest effort with years of active, sparkling presence in the mid-water column.
Frequently asked questions
Is the Dawn Tetra the same as the Bloodfin Tetra?
No. Both belong to the genus Aphyocharax, but the Dawn Tetra (A. nattereri) is smaller — around 2.5 cm — with a black-and-white anal fin and a caudal-peduncle spot, while the Bloodfin Tetra (A. anisitsi) grows to 5 cm and has vivid red fins throughout.
How many Dawn Tetras should I keep together?
A minimum group of eight is recommended. Like most small characins they are considerably more confident, active and better-coloured in larger numbers; a group of twelve or more in a planted tank produces the best display.
What you need to keep a dawn 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 dawn tetra in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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