Peruvian tetra
Hyphessobrycon peruvianus
Peruvian tetra exhibits a silvery body with distinctive black horizontal stripes and vibrant red coloration on its fins.
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About the Peruvian tetra
Hyphessobrycon peruvianus is a small Upper Amazon tetra from Peru that really comes alive in a proper group - the shoaling is the whole point with this one. Keep it in soft-ish, slightly acidic water and it will stay active and calm, with that classic Hyphessobrycon vibe of always being in motion without being a jerk.
Also known as
Quick Facts
Size
4 cm
Temperament
Peaceful
Difficulty
Intermediate
Min Tank Size
20 gallons
Lifespan
3-5 years
Origin
South America (Amazon River basin: Ecuador, Peru, Colombia, Brazil)
Diet
Omnivore leaning insectivore - good micro pellets/flake plus frozen/live foods (daphnia, brine shrimp, small insects)
Water Parameters
22-27°C
5-7
2-10 dGH
Need a heater for this species?
This species needs 22-27°C in a 20 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Keep them in a real group (8+). In smaller numbers they may become shy/stressed and any tetras can become more prone to fin-nipping.
- A 20 gallon long or bigger works way better than a tall tank - they like to cruise. Give them plants and some wood or leaf litter so they feel covered, plus a little open swimming room up front.
- They look and act best in soft, slightly acidic water (roughly pH 5.0-7.0; very low to moderate hardness) and steady temps around 22-27C. If your tap is hard and alkaline, consider diluting with RO water rather than chasing pH with chemicals.
- Feed small foods they can grab fast: good micro pellets or flakes as the base, then rotate in frozen daphnia, cyclops, brine shrimp, and bloodworms. Small meals 1-2 times a day keeps them colored up without turning the tank into a nitrate factory.
- Great with other chill community fish that like similar water: corys, small plecos, otos, hatchetfish, pencilfish, and other small tetras. Skip slow long-finned fish like bettas and fancy guppies - these guys can get mouthy.
- They are jumpers when startled, especially right after you bring them home, so use a lid and keep lighting on the calmer side. Sudden bright lights + no cover = torpedo tetra on the floor.
- If you want to breed them, a separate dim tank with a mesh/marbles on the bottom helps because they will eat the eggs. Condition with live/frozen foods, use softer water, and pull the adults after spawning; fry take tiny foods like infusoria or powdered fry food at first.
Compatibility
Good Tankmates
- Other small, chill schooling tetras (ember, glowlight, black neon) - they all occupy the same midwater space and nobody gets pushy as long as you keep each species in a proper group
- Corydoras catfish (pandas, peppers, sterbai) - peaceful bottom crew, totally ignore the Peruvian tetras and help keep the vibe calm
- Small peaceful loricariids (e.g., Otocinclus; smaller Ancistrus) - generally fine if the pleco species suits the tank size and water conditions
- Otocinclus - great with them in a planted setup, super non-confrontational, just make sure the tank is mature so the otos have steady grazing
- Dwarf cichlids that are on the mild side (Apistogramma, Bolivian ram) - usually fine if you have plants and line-of-sight breaks, just watch during spawning since they can get a little territorial near the bottom
- Hatchetfish (marbled or silver) - they hang at the surface while the Peruvian tetras cruise midwater, so everyone keeps to their lane (use a tight lid, hatchets jump)
Avoid
- Anything nippy like tiger barbs - Peruvian tetras are peaceful and can get stressed and shredded if the tank has fin-biters that treat midwater fish like chew toys
- Big aggressive cichlids (convicts, green terrors, most big Central/South Americans) - the tetras are basically bite-sized snacks and will spend all day hiding if they are not eaten first
- Fast, pushy feeders like larger danios in a tight tank - they can outcompete the tetras at mealtime and keep them on edge, especially if the Peruvian tetras are in a small group
- Slow fish with long fins (bettas, fancy guppies) - usually not worth the gamble because active tetras can get curious and start doing the occasional fin-check, especially if the tetra group is small
Where they come from
Peruvian tetras (Hyphessobrycon peruvianus) come from Peru in the upper Amazon area, where the water is often tea-colored from leaf litter and wood. Think slow side channels, calm backwaters, and lots of shade. That vibe explains a lot about what makes them look confident in a home tank.
If you have ever kept other Hyphessobrycon (like ember or serpae types), the Peruvian tetra feels familiar, but it is a little more sensitive to messy water and a little less forgiving of boisterous tankmates.
Setting up their tank
Give them space to school and a few shady areas to retreat to. I have had the best luck with a longer tank rather than a tall one. They use the midwater a lot, and they look way better when they can cruise together instead of ping-ponging around decor.
- Tank size: 20 gallons long works for a small group, bigger is noticeably better if you want a proper school
- Group size: 8-12 is the sweet spot (6 is the bare minimum, but they are bolder in bigger numbers)
- Layout: open swimming lane in the middle, plants and wood around the edges
- Lighting: they color up under medium to dim light, especially with floating plants
- Substrate/decor: darker substrate, driftwood, and a layer of leaf litter if you like that look
For water, aim for clean and steady more than chasing a magic number. Soft to moderately hard is fine, but they act most relaxed in slightly acidic to neutral water. Keep the filter flow gentle or at least broken up with spray bars or plants so they are not fighting a river all day.
If you want that Amazon feel without turning the tank into a science project, toss in a small bag of botanicals (catappa leaves, alder cones) or a piece of driftwood. It helps them settle, and it takes the harsh edge off bright tanks.
What to feed them
They are easy to feed once they are settled. Mine did best on a mix: a quality small pellet or flake as the base, plus a steady rotation of frozen and live foods. The extra protein brings out better color and keeps the group more active.
- Staples: small pellets, micro granules, or a good flake that does not turn to dust instantly
- Frozen: brine shrimp, daphnia, cyclops, chopped bloodworms (go easy on bloodworms if your tank runs warm and rich)
- Live (if you do it): baby brine shrimp, daphnia, grindal worms
Feed smaller portions than you think, 1-2 times a day. They will keep eating if you keep dumping it in, and then you get the classic tetra problem: bloating, stringy poop, and water that slowly slides downhill.
How they behave and who they get along with
Peruvian tetras are classic midwater schooling fish. In a proper group they spend a lot of time cruising together, and the little pecking order stuff stays pretty mild. In too-small groups, they get skittish and you will see more fin-nipping and corner-hugging.
- Good tankmates: other peaceful tetras, hatchetfish, pencilfish, small rasboras, corydoras, small plecos, calm dwarf cichlids (apistos) in a roomy tank
- Use caution with: long-finned fish (they may test those fins), very fast feeders that outcompete them, pushy barbs
- Avoid: aggressive cichlids, fin-shredders, or anything that treats tetras like snacks
If you see nipping, do not assume you have a mean fish. Usually it is one of three things: the group is too small, the tank is too bare/bright, or feeding is too light and everyone is edgy at mealtime.
Breeding tips
Breeding them is doable, but it is not quite as plug-and-play as some other small tetras. They are egg scatterers, and the adults will absolutely snack on eggs and fry if you give them a chance. I have only had consistent results in a separate breeding setup.
- Use a small breeding tank with a sponge filter and gentle air
- Dim the light and add a spawning mop or a dense clump of fine-leaved plants (java moss works)
- Condition the adults for a week or two with frozen/live foods
- Softer, slightly acidic water tends to help with hatch rates
- Pull the adults right after spawning, or use a mesh/egg crate so eggs fall out of reach
The first foods matter. Newly hatched fry usually need tiny stuff at first (infusoria-type foods), then baby brine shrimp once they can take it. If you do not want to mess with microfoods, plan ahead or the first batch will disappear before you ever see them.
Keep the breeding tank squeaky clean but not sterile. A seasoned sponge filter and a little biofilm on plants makes early fry life a lot easier than a brand-new bare tank.
Common problems to watch for
Most issues I have seen with Peruvian tetras trace back to stress: unstable water, too much light with no cover, or being kept in tiny groups. Once they are comfortable, they are pretty steady fish.
- Ich after a new addition or temperature swing (quarantine new fish if you can)
- Fin nipping in understocked groups or crowded tanks
- Loss of color and hiding in bright, bare setups
- Bloating/constipation from overfeeding rich foods
- Mouth or body fungus after minor injuries in dirty water
They do not love sudden changes. If you are doing big water changes, match temperature closely and avoid big swings in hardness/pH. Small, regular changes beat occasional huge ones with this species.
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