Amapá Tetra (Hyphessobrycon amapaensis)
A brilliant scarlet-and-silver tetra from the Rio Amapá, rare in the trade but startlingly vivid in a heavily planted blackwater tank.
Will it live with a Amapá Tetra?
We compare each fish against your amapá tetra on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- African Dwarf Frog✅ CompatiblePeaceful · 4 cm · Medium care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Amapá Tetra 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 Amapá 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 Danio✅ CompatiblePeaceful · 4 cm · Easy care · 21–26 °C (70–79 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Blue Danio in a shoal of 6+ or it gets stressed and nippy.
- Blue Emperor Tetra✅ CompatiblePeaceful · 4 cm · Medium 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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Blue Emperor Tetra in a shoal of 6+ or it gets stressed and nippy.
- Cardinal Tetra✅ CompatiblePeaceful · 4 cm · Medium 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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Cardinal Tetra in a shoal of 6+ or it gets stressed and nippy.
- Emperor Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 23–27 °C (73–81 °F)
- Both are peaceful, and their water overlaps around 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Emperor Tetra in a shoal of 6+ or it gets stressed and nippy.
- Flame Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Flame Tetra in a shoal of 6+ or it gets stressed and nippy.
- Glowlight Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Glowlight Tetra 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)
- Compatible on the things that matter: shared water near 24–27 °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 Amapá 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.
- Golden Dwarf Barb✅ CompatiblePeaceful · 4 cm · Easy care · 18–24 °C (64–75 °F)
- Compatible on the things that matter: shared water near 24–24 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Golden Dwarf Barb in a shoal of 6+ or it gets stressed and nippy.
- Jelly Bean Tetra✅ CompatiblePeaceful · 4 cm · Medium care · 20–26 °C (68–79 °F)
- Both are peaceful, and their water overlaps around 24–26 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Jelly Bean Tetra in a shoal of 10+ or it gets stressed and nippy.
- Marbled Hatchetfish✅ CompatiblePeaceful · 4 cm · Medium care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Marbled Hatchetfish in a shoal of 6+ or it gets stressed and nippy.
- Otocinclus✅ CompatiblePeaceful · 4 cm · Medium care · 21–26 °C (70–79 °F)
- Both are peaceful, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Otocinclus in a shoal of 6+ or it gets stressed and nippy.
- Phoenix Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Phoenix Tetra in a shoal of 8+ or it gets stressed and nippy.
- Purple Tetra✅ CompatiblePeaceful · 4 cm · Medium care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 24–26 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Purple Tetra in a shoal of 8+ or it gets stressed and nippy.
- Rainbow Emperor Tetra✅ CompatibleSemi-aggressive · 3.6 cm · Medium care · 22–28 °C (72–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
- Red Phantom Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Red Phantom Tetra in a shoal of 8+ or it gets stressed and nippy.
- Rosy Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Rosy Tetra in a shoal of 6+ or it gets stressed and nippy.
- Rummy Nose Rasbora✅ CompatiblePeaceful · 4 cm · Medium care · 20–26 °C (68–79 °F)
- Both are peaceful, and their water overlaps around 24–26 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Rummy Nose Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Sparkling Gourami✅ CompatiblePeaceful · 4 cm · Medium care · 24–28 °C (75–82 °F)
- Both are peaceful, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Strawberry Betta✅ CompatiblePeaceful · 4 cm · Medium care · 22–27 °C (72–81 °F)
- Compatible on the things that matter: shared water near 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Threadfin Rainbowfish✅ CompatiblePeaceful · 4 cm · Medium care · 24–28 °C (75–82 °F)
- Both are peaceful, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Threadfin Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Tiger Otocinclus✅ CompatiblePeaceful · 4 cm · Medium 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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Tiger Otocinclus in a shoal of 6+ or it gets stressed and nippy.
- Yellow Phantom Tetra✅ CompatiblePeaceful · 4 cm · Easy care · 23–27 °C (73–81 °F)
- Both are peaceful, and their water overlaps around 24–27 °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 Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Yellow Phantom Tetra in a shoal of 6+ 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 Amapá Tetra at times; give dense cover and watch them at feeding.
- Keep Amapá 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)
- Expect Black Ruby Barb to harass Amapá Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Amapá 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)
- Black Skirt Tetra and Amapá Tetra are close in size, but the semi-aggressive one tends to dominate — add amapá tetra in a group to spread the pressure.
- Keep Amapá 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.
- Cherry Shrimp⚠️ With cautionPeaceful · 3 cm · Easy care · 18–28 °C (64–82 °F)
- Adult Cherry Shrimp might survive with Amapá Tetra, but expect the young to be eaten — plant heavily.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Cherry Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Desert Goby⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °F)
- Desert Goby is semi-aggressive and may chase or nip the smaller Amapá Tetra — plant heavily and break up sight lines.
- Keep Amapá 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 Amapá 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.
- Ghost Shrimp⚠️ With cautionPeaceful · 4 cm · Easy care · 18–28 °C (64–82 °F)
- Adult Ghost Shrimp might survive with Amapá Tetra, but expect the young to be eaten — plant heavily.
- Keep Amapá 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.
- Humpbacked Tetra⚠️ With cautionSemi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Humpbacked Tetra and Amapá Tetra are close in size, but the semi-aggressive one tends to dominate — add amapá tetra in a group to spread the pressure.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Amapá 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 Amapá 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.
- Serpae Tetra⚠️ With cautionSemi-aggressive · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Serpae Tetra and Amapá Tetra are close in size, but the semi-aggressive one tends to dominate — add amapá tetra in a group to spread the pressure.
- Keep Amapá Tetra in a shoal of 6+ 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 and Amapá Tetra are close in size, but the semi-aggressive one tends to dominate — add amapá tetra in a group to spread the pressure.
- Keep Amapá 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 Amapá Tetra at times; give dense cover and watch them at feeding.
- Keep Amapá 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)
- Expect Striped Red-Eye Puffer to harass Amapá Tetra at times; give dense cover and watch them at feeding.
- Keep Amapá Tetra in a shoal of 6+ 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 Amapá Tetra — plant heavily and break up sight lines.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Tiger Shrimp⚠️ With cautionPeaceful · 3 cm · Hard care · 20–25 °C (68–77 °F)
- Adult Tiger Shrimp might survive with Amapá Tetra, but expect the young to be eaten — plant heavily.
- Keep Amapá Tetra in a shoal of 6+ or it gets stressed and nippy.
- Keep Tiger Shrimp 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)
- Wine Red Betta and Amapá Tetra are close in size, but the aggressive one tends to dominate — add amapá tetra in a group to spread the pressure.
- Keep Amapá 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)
- Amapá Tetra is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- Expect Alligator Gar to harass Amapá Tetra at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Keep Amapá 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)
- Amapá Tetra is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
- Clown Knifefish clearly outsizes Amapá 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 Amapá 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)
- Size gap is too large (100 vs 4 cm): Fire Eel will treat Amapá Tetra as food.
- Fire Eel is semi-aggressive and may chase or nip the smaller Amapá Tetra — plant heavily and break up sight lines.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Keep Amapá 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 cm): Koi will treat Amapá Tetra as food.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Keep Amapá 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 4 cm Amapá Tetra whole.
- Redtail Catfish clearly outsizes Amapá 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 Amapá 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)
- Amapá Tetra is bite-sized to a 90 cm predatory spotted gar — it will be eaten.
- Spotted Gar clearly outsizes Amapá 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 Amapá 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 4 cm): Wels Catfish will treat Amapá Tetra as food.
- Wels Catfish is aggressive and may chase or nip the smaller Amapá 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 Amapá 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 4 cm Amapá Tetra whole.
- Wolf Cichlid is aggressive and may chase or nip the smaller Amapá 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 Amapá 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.
Amapá Tetra care specs
- Care level
- Medium
- Breeding
- Hard
- Max size
- 4 cm (1.6 in)
- Min tank size
- 60 L (15.9 gal)
- Temperature
- 24–27 °C (75–81 °F)
- pH
- 6–7.5
- Hardness
- 1–10 dGH
- Lifespan
- 3–5 years
- Diet
- Omnivore
- Swim level
- Middle
- Group size
- 6+ (shoaling)
- Family
- Characidae
- Origin
- South America — Rio Amapá Grande, Amapá state, Brazil
What is an Amapá Tetra?
The Amapá Tetra (Hyphessobrycon amapaensis) is a small characid from the Rio Amapá Grande drainage in the northeastern Brazilian state of Amapá. Growing to just 4 cm (1.6 in), it is compact even by tetra standards, but what it lacks in size it more than compensates for in colour: a vivid scarlet body is bisected lengthways by a bright silver-white lateral stripe running from behind the gill plate almost to the caudal fin, producing a clean two-tone pattern that pops against dark substrate and green plants. In the hobby it circulates under the synonyms Red-line Tetra and Scarlet Tetra — the Latin binomial is the only reliable identifier.
Genuine imports are uncommon, and most available stock is captive-bred by specialist breeders. That rarity makes locating a good-sized group an exercise in patience, but the reward is real: a school of six or more held in tannin-stained water, moving as a unit, is one of the more striking sights a blackwater community tank can offer.
Where does the Amapá Tetra come from?
Wild H. amapaensis are native to the blackwater rivers of Amapá state in far northeastern Brazil — a region of dense rainforest and deeply stained, extremely soft waterways draining into the lower Amazon basin. The Rio Amapá Grande, the species’ type locality, is a classic Amazonian blackwater environment: high tannin load, very low hardness, gently acidic pH, dense riparian vegetation providing shade and leaf litter, and slow to moderate current.
Understanding this origin is the key to long-term success with the species. These are not general-purpose tetras adapted to variable tap water; they are specialists shaped by a specific chemical and visual environment. Replicating that environment — soft, slightly acidic, dimly lit, tannin-coloured — is what keeps them colourful, calm and healthy in captivity.
What size tank does an Amapá Tetra need?
The practical minimum is 60 litres (16 gal), and that figure assumes a footprint long enough to let a school swim in a loose formation rather than orbit a cramped circuit. A tank of 75–90 litres (20–24 gal) with a 60 cm (24 in) or longer base is more comfortable and gives more scope for planting and hardscape.
Decoration should reflect the species’ blackwater origin: driftwood branches or roots, fine-leaved plants such as Microsorum, Cryptocoryne or floating Salvinia, and a layer of dried leaf litter (Indian almond, oak or beech) on the substrate. Dark substrate — black sand or fine dark gravel — both evokes the riverbed and dramatically intensifies the fish’s colour. Aim for low to moderate lighting; Amapá Tetras are not a bright-light species, and diffuse illumination through floating plants is ideal. Good filtration with a gentle flow is important — they come from rivers, not stagnant ponds — but strong surface agitation is unnecessary.
What water parameters does the Amapá Tetra need?
- Temperature: 24–27 °C (75–81 °F) — the mid-range of tropical temperatures; avoid pushing toward 28 °C long-term.
- pH: 6.0–7.5; the lower end of that range (6.0–6.8) produces the most vivid colouration.
- Hardness: 1–10 dGH; these are true soft-water fish and do not adapt well to hard, alkaline tap water.
For aquarists with hard municipal supply, cutting tap water 50–80% with reverse-osmosis or deionised water, then remineralising lightly, is the standard approach. Adding peat to the filter, or using Indian almond leaves and alder cones in the tank, lowers pH naturally and introduces tannins that the fish recognise as home. Stability, as always, matters: a stable pH of 6.5 beats wild swings between 6.0 and 7.5.
What do Amapá Tetras eat?
Amapá Tetras are omnivores with a strong lean toward small animal prey in the wild — insect larvae, micro-crustaceans and zooplankton make up the bulk of the natural diet. In the aquarium a good-quality micro-pellet or fine-ground flake covers the nutritional baseline, but condition and colour improve markedly with regular live or frozen supplementation.
Suitable supplementary foods include:
- Micro-worms, banana worms, vinegar eels — ideal for the smallest specimens or conditioning for breeding.
- Baby brine shrimp (nauplii) — a near-universal trigger for colour and activity.
- Daphnia and cyclops — nutritionally rich and naturalistic.
- Small frozen bloodworm — accepted eagerly; use as an occasional treat rather than a staple.
Feed small amounts once or twice daily — Amapá Tetras have tiny mouths and correspondingly small stomachs. Uneaten food in a blackwater tank fouls water fast, so portion control matters. A weekly fasting day benefits digestive health.
Are Amapá Tetras peaceful — and what fish can they live with?
The Amapá Tetra is a peaceful, shoaling mid-water species — one of the least troublesome fish you can keep in a soft-water community, provided tank-mates share its water-chemistry requirements. Maintain a group of at least six (eight or more is better) to bring out the schooling behaviour and reduce individual stress; a lone or paired specimen will often hide and refuse food.
Compatible tank-mates in a blackwater community include:
- Other small, peaceful soft-water tetras (Nematobrycon palmeri, Hyphessobrycon sweglesi, pencilfish)
- Small Corydoras species comfortable at lower hardness (C. sterbai, C. habrosus)
- Dwarf cichlids such as Apistogramma species, which occupy the lower zone and rarely bother mid-water tetras
- Otocinclus catfish for algae control
Avoid fin-nippers, large or boisterous species, and any fish requiring harder, alkaline water. Large cichlids, tiger barbs and similar active nippers are incompatible. Avoid mixing with fish that need very different temperature windows.
For a full list of tested companions, see Amapá Tetra tank mates.
How do you tell male and female Amapá Tetras apart?
Sexing adult Amapá Tetras is possible, though it requires well-conditioned, fully grown fish. Females become noticeably deeper-bodied when mature, especially when carrying eggs — viewed from above or from the front, the abdomen is distinctly rounder than on a male of equivalent age. Males are slimmer in the body and tend to show marginally more intense red colouration, particularly when in spawning condition or displaying to rivals.
Outside of breeding condition, the difference can be subtle in younger fish, and the two sexes may be difficult to distinguish reliably. Purchasing a group of at least six from a reputable source and allowing them to grow on together is the most practical way to end up with a balanced sex ratio.
How do Amapá Tetras breed?
Breeding H. amapaensis is rated hard — achievable in a dedicated setup but not a casual undertaking. Like most small characids, they are egg-scatterers that show no parental care and will readily eat their own eggs if not removed.
A practical approach:
- Conditioning: Feed the breeding group heavily on live and frozen foods for two to three weeks.
- Breeding tank: Set up a separate 20–40 L vessel with very soft, slightly acidic water (pH 6.0–6.5, hardness below 5 dGH) and dim lighting. A layer of fine-leaved plants or a spawning mop provides egg-catching surface; a mesh or grid on the bottom prevents adults from reaching eggs that fall through.
- Spawning: Introduce a well-conditioned pair or trio (two males, one female) in the evening. Spawning typically occurs in the morning, with the male driving the female through plant thickets as eggs are scattered.
- Egg care: Remove adults immediately after spawning. Eggs are small and light-sensitive; keep the tank dark until they hatch (typically 24–36 hours at 26 °C).
- Fry: Free-swimming fry require infusoria or commercial fry food for the first few days before graduating to micro-worms and baby brine shrimp nauplii.
Successful captive breeding with this species is still relatively uncommon, and the keeper who masters it is a genuine contributor to the hobby’s supply of tank-bred stock.
What diseases are common in Amapá Tetras?
Amapá Tetras kept in appropriate water conditions are reasonably hardy, but several diseases deserve mention:
- White spot (ich / Ichthyophthirius multifiliis): The classic small-white-dot disease, usually introduced via new fish or plants. Quarantine all new additions for at least two weeks before adding them to the main display. Raise temperature gradually to the upper end of the range as part of treatment.
- Velvet (Oodinium spp.): Appears as a fine gold or rust-coloured dust on the body, often mistaken for the fish’s natural iridescence at first. Again, quarantine and immediate response are key; this disease spreads rapidly.
- Fin rot: Ragged, receding fin edges are almost always a water-quality problem. Maintain low nitrates, perform regular partial water changes, and the condition typically resolves without intervention once water is clean.
- Neon tetra disease (Pleistophora hyphessobryconis): A parasitic infection that can affect small tetras, causing pale patches and wasting. There is no practical cure; remove affected fish promptly and review husbandry.
- Internal parasites: Wild-caught specimens may carry intestinal worms; prophylactic treatment of new imports before introducing them to the display tank is good practice.
Prevention centres on three pillars: correct water chemistry (soft, slightly acidic, nitrate below 20 ppm), a quarantine protocol for all new stock, and avoiding sudden parameter swings.
Health note: Disease identification and medication dosing are beyond the scope of a care profile. If you suspect illness, confirm symptoms against a reputable veterinary or fish-health resource before treating. Incorrect medication in a blackwater tank can wipe out the biological filter.
How long do Amapá Tetras live?
With good care, Amapá Tetras can live 3–5 years. That lifespan is typical for small tetras in the 4 cm range and is achievable in captivity when water chemistry is maintained consistently and diet is varied. The most common factor cutting the lifespan short is chronic exposure to hard or alkaline water, which compromises immune function and colouration over time even if it does not cause immediate visible distress.
Tank-bred specimens from established lines tend to acclimatise more readily than wild imports and often prove the hardier long-term residents. Buy from a source that can confirm captive provenance where possible, keep the water soft and clean, maintain a school of at least six, and a group of Amapá Tetras will be a highlight of a blackwater community for years.
Frequently asked questions
Is the Amapá Tetra the same as the Ember Tetra or Serpae Tetra?
No — all three belong to Hyphessobrycon but are distinct species. The Amapá Tetra (H. amapaensis) is larger than the Ember Tetra (H. amandae) and carries a bright silver lateral stripe that neither the Ember nor the Serpae displays. It is also considerably rarer in the trade.
What water conditions does the Amapá Tetra need?
It comes from soft, acidic blackwater rivers and does best at pH 6.0–7.5 and hardness below 10 dGH. Peat or Indian almond leaves help recreate the tannin-rich chemistry it prefers. Hard, alkaline tap water should be diluted with RO or rain water before use.
What you need to keep a amapá tetra
The baseline is a heated, filtered 60 L+ tank: a reliable heater to hold 24–27 °C (75–81 °F), a gentle filter that won't batter a amapá tetra in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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