Coffee-bean Tetra

Quick Summary

The Coffee-bean Tetra is a peaceful, hardy shoaling fish ideal for community aquariums of 80 litres or more. If you enjoy subtle beauty and relaxed tank mates, this understated little tetra is an excellent choice for beginners and experienced keepers alike.

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In this guide:

• Introduction
• Quick Stats
• Appearance
• Natural Habitat
• Tank Size and Setup
• Water Parameters
• Diet and Feeding
• Behaviour and Temperament
• Tank Mates
• Breeding

Introduction

The Coffee-bean Tetra (Hyphessobrycon takasei) is a charming and often overlooked member of the vast Hyphessobrycon genus. Named for the bold, dark, coffee-bean-shaped blotch on each flank, this small characin brings a quiet elegance to planted community tanks. It was first described by Gery in 1964 and hails from the slow-moving tributaries and flooded forest streams of northern South America, primarily in the lower Amazon basin and parts of the Guianas.

Despite being available in the hobby for decades, the Coffee-bean Tetra has never achieved the mainstream popularity of species like the Neon Tetra or Rummy-nose Tetra. This is a shame, because it is a genuinely easy fish to keep, breeds without extreme difficulty, and displays interesting shoaling behaviour when maintained in appropriate numbers. Its understated colouration – warm amber tones punctuated by that signature dark marking – makes it a lovely complement to brighter species or a standout in a biotope-style setup designed around blackwater conditions.

For aquarists looking for something a little different from the usual tetra fare, the Coffee-bean Tetra offers a rewarding and low-maintenance experience. In this guide, we cover everything you need to know to keep this species healthy and thriving in a home aquarium.

Appearance

The Coffee-bean Tetra is a modestly sized fish, reaching roughly 3.5 to 4 centimetres in standard aquarium conditions. Its body shape is typical of many Hyphessobrycon species – laterally compressed with a slightly deep profile and a gently forked caudal fin. The overall silhouette is compact and streamlined, well suited to its natural life among submerged roots and leaf litter.

The base body colour is a translucent, warm amber to pale golden hue. In good health and under appropriate lighting, the flanks can develop a subtle iridescent sheen, particularly toward the dorsal region. The fins are generally transparent to lightly tinted, sometimes showing a faint wash of yellow or orange, especially in well-conditioned males.

The defining feature, and the source of the common name, is the prominent dark marking on each side of the body. This blotch is deep brown to black and distinctly oval or bean-shaped, positioned roughly in the centre of the flank just behind the gill plate. It is immediately noticeable and gives the fish a distinctive appearance that sets it apart from other similarly sized tetras. In some individuals, the blotch is very sharply defined; in others, it may appear slightly diffused around the edges, but it is always conspicuous.

There is a degree of sexual dimorphism, though it is not dramatic. Males tend to be slightly slimmer and may show marginally more intense colouration, particularly in the fins, when in breeding condition. Females are typically a touch deeper-bodied when mature, especially when carrying eggs, and their colouration is generally a little more muted. Telling the sexes apart reliably usually requires having a group of adults in good condition for comparison.

Juveniles display the characteristic body blotch from a relatively young age, making identification straightforward even in mixed batches at fish shops. The overall colouration intensifies as the fish matures and settles into a well-maintained aquarium with appropriate water conditions and diet.

Natural Habitat

Hyphessobrycon takasei is found across a wide area of northern South America, including tributaries and smaller watercourses associated with the lower Amazon basin in Brazil, as well as river systems in Guyana, Suriname, and French Guiana. This broad distribution suggests the species is adaptable, though it shows a clear preference for certain habitat types.

In the wild, Coffee-bean Tetras inhabit slow-moving streams, creeks, and flooded forest areas where the water is often stained a deep brown by tannins leaching from decaying leaves and wood. These blackwater and clearwater habitats are typically soft and acidic, with a pH that can drop below 5.5 during the rainy season. The substrate is generally composed of sand, mud, and a thick layer of leaf litter, which provides both food sources (microorganisms and small invertebrates) and shelter from predators.

Vegetation in these habitats varies. Some collection sites feature dense marginal vegetation and overhanging riparian plants that cast heavy shade over the water, while others are more open but still relatively dim due to the dark water colour and forest canopy overhead. Submerged root tangles, fallen branches, and decomposing plant matter create a complex environment with plenty of hiding spots.

The water flow in these environments is gentle to negligible, particularly in the flooded forest zones where the species is often found during the wet season. Understanding this natural habitat is key to replicating conditions in the aquarium – dim lighting, soft and slightly acidic water, and plenty of natural cover will help bring out the best in this species.

Tank Size and Setup

A minimum tank size of 80 litres is recommended for a group of Coffee-bean Tetras. As a shoaling species, they should be kept in groups of at least six, though eight to twelve is preferable. Larger groups display more natural behaviour and the fish will be noticeably more confident and less prone to stress. A longer tank footprint (such as a standard 80 x 35 cm base or larger) is preferable to a tall, narrow one, as it provides more swimming space in the middle water column where this species prefers to spend its time.

The ideal setup draws inspiration from the species’ natural blackwater habitat. A dark, fine-grained substrate – either sand or a fine gravel in brown or black tones – makes an excellent base. This not only looks natural but also helps the fish’s colouration appear more vivid, as pale substrates can cause shy species to wash out.

Decor should include plenty of driftwood, bogwood, or branching root structures. These serve as visual barriers and resting spots, and they also release tannins into the water over time, which can help lower pH slightly and create the slightly tea-coloured water that mimics the species’ natural environment. Adding dried Indian almond leaves (Terminalia catappa) or oak leaves to the tank floor is another excellent way to introduce tannins and provide a naturalistic leaf litter layer. The leaves will break down slowly and can also support the growth of beneficial biofilm and microorganisms that the fish will graze on.

Live plants are not strictly necessary but are highly recommended. Species that tolerate softer, more acidic water work well – Java Fern (Microsorum pteropus), Java Moss (Taxiphyllum barbieri), Anubias species, and various Cryptocoryne species are all excellent choices. Floating plants such as Amazon Frogbit (Limnobium laevigatum) or Salvinia are particularly beneficial, as they dim the lighting naturally and provide a sense of overhead cover that makes the fish feel more secure.

Lighting should be moderate to subdued. Coffee-bean Tetras are not fans of intense illumination and will spend much of their time hiding if the tank is too brightly lit. If you are growing plants that require stronger light, use floating plants or tall background plants to create shaded areas where the tetras can retreat.

A secure lid is advisable, as small tetras can occasionally jump, particularly when startled or during boisterous feeding times.

Water Parameters

The Coffee-bean Tetra is reasonably adaptable when it comes to water chemistry, which is one of the reasons it is considered an easy species to keep. That said, it will look its best and be most likely to breed in conditions that lean toward the softer, more acidic end of its tolerance range. The key, as with all tropical fish, is stability – avoid sudden swings in temperature or chemistry.

Regular partial water changes of 20 to 30 per cent weekly are the simplest way to maintain good water quality and keep nitrate levels low. When performing water changes, ensure the replacement water is close in temperature and chemistry to the tank water to avoid shocking the fish. If your tap water is hard and alkaline, you may wish to use a blend of reverse osmosis (RO) water and tap water to achieve softer, more acidic conditions.

The species tolerates a fairly wide pH range in practice, and many hobbyists successfully keep Coffee-bean Tetras in neutral water around pH 7.0 without issues. However, for breeding or for the most vibrant colouration, aiming for a pH between 6.0 and 6.8 with a GH of 2 to 8 dGH is ideal. The use of tannin-releasing botanicals such as driftwood and dried leaves will gently lower pH over time and help buffer the water in a naturalistic way.

Filtration and Equipment

Coffee-bean Tetras do not require anything unusual in terms of filtration, but good water quality is essential for their long-term health. A reliable filter rated for the volume of your tank – or slightly above – is all that is needed. For an 80 to 120 litre setup housing a shoal of these tetras along with a few tank mates, a quality hang-on-back filter or a small external canister filter will work well.

Because this species naturally inhabits slow-moving water, keep the flow rate gentle. If your filter creates a strong current, use a spray bar or baffle to disperse the output. Constantly battling a strong current will stress the fish and cause them to hide rather than shoal openly in the midwater.

Sponge filters are another excellent option, especially in smaller or breeding setups. They provide gentle biological filtration, create minimal current, and are safe for fry if breeding occurs. An air-powered sponge filter paired with a small air pump is a cost-effective and reliable solution.

A heater is necessary in most climates to maintain the tropical temperature range of 23 to 28 C. Choose a heater appropriate for your tank volume and use a separate thermometer to verify the temperature, as built-in heater thermostats can sometimes be inaccurate. A setting of around 25 to 26 C is a good general target for a community tank containing this species.

Lighting, as mentioned in the tank setup section, should be moderate to subdued. A standard LED unit on a timer providing 8 to 10 hours of light per day is sufficient, especially if the tank includes floating plants to soften the illumination. Avoid leaving the lights on for excessively long periods, as this encourages algae growth and can stress the fish.

Diet and Feeding

The Coffee-bean Tetra is an omnivore with a small mouth, and feeding it is straightforward. In the wild, its diet consists of tiny invertebrates, insect larvae, algae, and organic detritus found among leaf litter and plant matter. In captivity, it readily accepts a wide range of prepared and live foods.

A high-quality micro-pellet or crushed flake food formulated for small tropical fish should form the staple of the diet. Look for products with a good balance of protein and plant-based ingredients. Because of the species’ small mouth, ensure that food particles are appropriately sized – finely crushed flakes or micro-granules are ideal.

To promote the best health and colouration, supplement the staple diet with regular offerings of small live or frozen foods. Baby brine shrimp (Artemia nauplii), Daphnia, Moina, cyclops, and micro-worms are all excellent choices and will be eagerly consumed. Frozen bloodworm can be offered occasionally, though it should be chopped or offered in the smallest available size grade, as whole bloodworm can be too large for this species to handle comfortably.

Feed small amounts two to three times per day rather than one large feeding. The fish should be able to consume all offered food within two to three minutes. Overfeeding is a common mistake with small tetras and leads to poor water quality, which in turn causes health problems. It is far better to underfeed slightly than to overfeed.

Variety is important. Alternating between different food types throughout the week ensures that the fish receive a broad nutritional profile. This is particularly relevant if you are hoping to condition the fish for breeding, in which case increasing the proportion of high-protein live and frozen foods for a week or two before attempting to spawn them will help bring adults into breeding condition.

Behaviour and Temperament

The Coffee-bean Tetra is a peaceful, non-aggressive shoaling species that spends most of its time in the middle water column. It is not a fin nipper and shows no territorial behaviour under normal circumstances. This makes it an excellent citizen of a community aquarium.

In a well-sized group (eight or more), Coffee-bean Tetras form a loose, attractive shoal that drifts through the tank together, tightening up when they feel slightly uncertain and spreading out when they are relaxed. Males may occasionally display to one another with brief, harmless posturing – spreading their fins and showing their flank markings – but these interactions never escalate into real aggression.

When kept in groups that are too small (fewer than six), the fish may become skittish and spend excessive time hiding. Solitary individuals or pairs are likely to be chronically stressed, which suppresses their immune system and shortens their lifespan. Always keep this species in a group of at least six, ideally more.

The species is somewhat shy, particularly when first introduced to a new tank. Expect them to hide behind plants and driftwood for the first few days. As they settle in and learn the feeding routine, they will become progressively bolder. Providing plenty of cover paradoxically makes the fish more visible, as they feel secure enough to venture into open water.

Coffee-bean Tetras are most active during the daytime but tend to be calmer and less frenetic than some other small tetras. They have a gentle, almost contemplative swimming style that lends a sense of calm to a planted aquarium. They are not particularly active at feeding time compared to more boisterous species, so take care to ensure they are actually getting food if kept with more assertive feeders.

Tank Mates

The Coffee-bean Tetra’s peaceful nature and small size make it compatible with a wide range of similarly tempered community fish. The best tank mates are other small, calm species that share a preference for soft to moderately hard water and will not outcompete the tetras for food or bully them. Avoid large, aggressive, or predatory fish that might view these small tetras as a snack.

Good tank mates

• Neon Tetra – A classic community tetra of similar size and temperament that thrives in the same water conditions.
• Ember Tetra – Another small, peaceful tetra that adds warm colour and occupies the same water column without conflict.
• Cardinal Tetra – Shares a preference for soft, acidic water and makes a visually stunning companion in blackwater setups.
• Pygmy Corydoras – A tiny, peaceful bottom-dweller that will not compete for midwater space and enjoys similar conditions.
• Panda Corydoras – A gentle bottom-dwelling catfish that complements tetras beautifully and helps clean up fallen food.
• Otocinclus – A small, algae-eating catfish that is completely non-threatening and excellent for planted tanks.
• Harlequin Rasbora – A calm, similarly sized shoaling fish that coexists peacefully and tolerates the same water parameters.
• Amano Shrimp – Useful algae-eating invertebrates that are too large for Coffee-bean Tetras to harass.
• Honey Gourami – A gentle, slow-moving surface dweller that occupies a different zone and adds variety to the community.

Fish to avoid

• Oscar – Far too large and predatory; would readily consume Coffee-bean Tetras.
• Jaguar Cichlid – A highly aggressive, large predatory cichlid entirely unsuitable for a small tetra community.
• Red-tail Catfish – Grows enormous and will eat anything that fits in its mouth, including small tetras.
• Convict Cichlid – Territorial and aggressive, especially when breeding, and will harass smaller fish relentlessly.
• Tiger Barb – A known fin nipper that can bully and stress smaller, calmer tetras.
• Chinese Algae Eater – Becomes aggressive and territorial as it matures, often harassing tank mates by latching onto their sides.
• Green Terror – A large, aggressive cichlid that is wholly incompatible with small, peaceful community fish.

Breeding

Breeding the Coffee-bean Tetra in captivity is achievable with some preparation, though it is not as commonly bred as some other Hyphessobrycon species. The process follows the typical pattern for egg-scattering characins: the fish spawn among fine-leaved plants or spawning mops, and the eggs are left unguarded. Parental care is absent, and the adults will readily eat their own eggs and fry if given the opportunity.

To condition a breeding pair or small group, increase the proportion of high-quality live and frozen foods in their diet for one to two weeks. Baby brine shrimp, Daphnia, and micro-worms are excellent conditioning foods. Well-conditioned females will appear noticeably plumper when viewed from above.

Set up a dedicated breeding tank of approximately 20 to 30 litres. The water should be soft and acidic – a pH of 5.5 to 6.5 and a GH of 2 to 4 dGH is ideal. Use aged, tannin-stained water or add Indian almond leaves to achieve this. The temperature should be at the warmer end of the species’ range, around 26 to 28 C. Filtration should be gentle – a small air-powered sponge filter is perfect.

The bottom of the breeding tank should be covered with a layer of Java Moss, spawning mops, or a mesh grid that allows eggs to fall through but prevents the adults from reaching them. Lighting should be very dim or the tank should be placed in a dark area, as the eggs and newly hatched fry are sensitive to light.

Introduce a well-conditioned pair (or a small group of two males and three or four females) to the breeding tank in the evening. Spawning often occurs in the early morning hours. The female will scatter small, adhesive eggs among the plants or mops, with the male fertilising them as they are released. A typical spawn can produce between 50 and 150 eggs, though numbers vary.

Remove the adults immediately after spawning to prevent egg predation. The eggs are semi-transparent and very small, hatching in approximately 24 to 36 hours at 27 C. The fry will be free-swimming roughly three to four days after hatching, once they have absorbed their yolk sacs.

First foods for the fry should be infusoria or commercially available liquid fry food, as the fry are extremely tiny. After a week or so, they can graduate to freshly hatched baby brine shrimp (Artemia nauplii) and micro-worms. Growth is steady but not rapid; expect the fry to take several months to reach a size where they can be safely introduced to a community tank.

Keep the breeding and rearing tank scrupulously clean with small, frequent water changes using water matched to the tank’s parameters. Maintaining stable, soft, acidic water throughout the rearing process is critical for good fry survival rates.

Common Diseases

The Coffee-bean Tetra is a robust species that is not particularly susceptible to any disease unique to its kind. However, like all freshwater fish, it can fall victim to common ailments when water quality deteriorates, the fish is stressed, or new arrivals introduce pathogens to the tank.

Ich (white spot disease), caused by the parasite Ichthyophthirius multifiliis, is one of the most frequently encountered problems. It presents as small white spots covering the body and fins, and affected fish may flash (rub against objects) and appear lethargic. Treatment involves gradually raising the temperature to 28 to 30 C and, if necessary, using a proprietary ich medication. Ensure any medication chosen is safe for use with small characins and follow the dosing instructions carefully.

Fin rot, a bacterial infection, can occur when fish are kept in poor water quality or suffer physical damage to their fins. The edges of the fins appear ragged, discoloured, or eroded. Improving water quality through increased water changes is often sufficient to resolve mild cases, but more advanced infections may require treatment with an antibacterial medication.

Neon Tetra Disease (Pleistophora hyphessobryconis), despite its name, can affect many small tetra species. Symptoms include loss of colour, cysts or lumps on the body, difficulty swimming, and a general wasting appearance. Unfortunately, there is no reliable cure, and affected fish should be humanely euthanised and removed to prevent the disease spreading to other tank inhabitants.

Internal and external parasites, including intestinal worms and skin flukes, can occasionally affect tetras, particularly wild-caught specimens. Quarantining new fish for two to four weeks before adding them to an established community is the single most effective way to prevent introducing disease. During quarantine, observe the fish closely for any signs of illness and treat prophylactically if indicated.

Prevention is always preferable to treatment. Maintaining excellent water quality, avoiding overstocking, feeding a varied and nutritious diet, and minimising stress through appropriate tank setup and compatible tank mates will go a very long way toward keeping your Coffee-bean Tetras healthy throughout their lives.

FAQs

How many Coffee-bean Tetras should I keep together?

A minimum of six is recommended, but eight to twelve or more is ideal. Larger groups exhibit more natural and confident behaviour, and the fish will shoal more attractively. In groups of fewer than six, they tend to become shy and may spend most of their time hiding, which diminishes both their welfare and your enjoyment of them.

Are Coffee-bean Tetras suitable for a beginner?

Yes, they are an excellent choice for beginners. They are hardy, tolerant of a reasonable range of water parameters, peaceful, and easy to feed. As long as the tank is fully cycled before adding them and basic maintenance is kept up, they are straightforward to care for. Their only real requirement beyond the basics is to be kept in an appropriately sized group.

Can Coffee-bean Tetras live with shrimp?

Adult Amano Shrimp and other larger shrimp species are generally safe with Coffee-bean Tetras. However, very small shrimp such as juvenile Cherry Shrimp or newly born shrimplets may be at some risk of predation. If you keep a breeding colony of dwarf shrimp, providing dense plant cover and moss will give the young shrimp places to hide and improve their survival rates alongside the tetras.

Do Coffee-bean Tetras need a heater?

In most homes, yes. They are tropical fish that require a stable temperature of 23 to 28 C. Unless your room temperature consistently stays within this range year-round, a reliable aquarium heater is essential. Even small temperature fluctuations outside this range can stress the fish and weaken their immune system over time.

Why are my Coffee-bean Tetras hiding all the time?

Newly introduced fish often hide for the first few days as they acclimatise. If the behaviour persists, check that the group size is adequate (at least six), the lighting is not too bright, there is sufficient plant cover and decor, and there are no aggressive tank mates causing stress. Adding floating plants and ensuring the tank has shaded areas often makes a significant difference to how boldly this species behaves.

Related Guides

• Ember Tetra Care Guide – Another small, peaceful tetra that thrives in similar planted setups and blackwater conditions.
• Cardinal Tetra Care Guide – A popular soft-water tetra with overlapping care requirements and excellent compatibility.
• Rosy Tetra Care Guide – A close Hyphessobrycon relative with comparable temperament and husbandry needs.
• Pygmy Corydoras Care Guide – An ideal bottom-dwelling companion for Coffee-bean Tetras in smaller community tanks.
• Honey Gourami Care Guide – A gentle centrepiece fish that pairs well with small tetras in peaceful communities.