Tuba Cichlid (Tomocichla tuba)

Choose the Tuba Cichlid for a big, fast-flowing aquarium

The Tuba Cichlid (Tomocichla tuba) is a large Central American cichlid from clear, fast-flowing rivers on the Caribbean side of Nicaragua, Costa Rica and Panama. It is one of the most unusual feeders in the cichlid family: in the wild it browses algae from stones and eats fruit that falls into the water. FishBase records a maximum of 30 cm total length, so this is a long-term centrepiece for a keeper with room for a very large aquarium and the patience to feed a plant eater properly.

It belongs to the cichlid family, Cichlidae, and to the tribe Heroini, the group that holds almost all Central American cichlids. FishBase describes its range as the Atlantic slope from the Escondido River in Nicaragua to the Cricamola River in Panama, in moderate to fast-flowing rivers with high water velocity. The species is assessed as Least Concern on the IUCN Red List.

Check the names on the label

The naming history is unusually tangled. Eschmeyer's Catalog of Fishes lists the species as first described by Seth Meek in 1912 from Victoria, Costa Rica, as Cichlasoma tuba. A fish described four years earlier as Tomocichla underwoodi turned out to be the same species, but Říčan and colleagues (2016) explain that the earlier name is a permanently invalid homonym, so tuba is the name that stands. They also found no support for the old idea that the tuba is a close relative of the Sieboldi cichlid, now Talamancaheros sieboldii, from the Pacific slope; the two only look alike.

Browse our South American cichlids, the wider American cichlids directory and the Central American cichlids page to compare it with its relatives. Many of them were once grouped, as the tuba was, in the old catch-all genus; you can find them among our cichlids once grouped in Cichlasoma.

Know exactly what you receive

One purchase supplies one live Tuba Cichlid. The size option is "Standard": the fish is sent at the size currently available, which is a young fish far smaller than the adult. Sex is not chosen or guaranteed, and young cichlids of this kind cannot be sexed reliably by eye.

The photographs show the type of fish, not the individual you will receive. They show a golden-olive fish with a row of large dark blotches along the side and a reddish edge to the tail. Říčan and colleagues describe the colour pattern of Tomocichla as developing in a distinctive sequence as the fish grows, so a young fish can look noticeably different from an adult, and colour also changes with mood and condition.

Decide on one fish or more before you order

• One fish: the simplest choice, and the one this listing is planned around.
• A pair: only in a very large aquarium, and only once you can see that two fish tolerate each other. Large cichlids that share a tank can fight seriously, so have a second aquarium ready.
• With other cichlids: choose robust species of a similar adult size and plan the space for all of them as adults.

Before you order, read our delivery and Live Arrival Guarantee information, and have the aquarium matured, heated and running with its full current before the fish arrives.

Plan the aquarium around a 30 cm adult

FishBase gives 30 cm total length as the maximum for this species. Total length includes the tail, and a deep-bodied cichlid of that length is a heavy, powerful fish. Every part of the plan, from glass size to filter rating, has to work for that adult.

No published source gives a minimum aquarium for the tuba cichlid itself. OATA's care sheet for American cichlids recommends at least 300 litres for the larger or more aggressive species over 15 cm. As a comparison, Seriously Fish recommends a base of at least 120 × 45 cm for Vieja fenestrata, a Central American cichlid of up to 300 mm standard length. Combining the two gives a sensible floor: at least 300 litres on a base of at least 120 × 45 cm. A 150 × 50 × 45 cm aquarium, for example, holds about 337 litres before décor.

Run a three-step space check

1. Measure the base: at least 120 cm long and 45 cm front to back; longer is better for a fish that swims against a current.
2. Work out the true volume: our tank volume calculator turns your measurements into litres.
3. Add every other fish as an adult: use our stocking calculator to check the full, grown population, not the sizes on the day you buy.

OATA advises keeping the aquarium away from draughts, heat sources and direct sunlight, and fitting a heater, because a UK room is too cool for a tropical fish all year round. A large, heavy aquarium also needs a stand rated for its full weight of water, gravel and rock.

Build a river layout with current and cover

Recreate a rainforest river rather than a planted community tank. Winemiller and colleagues (1995) studied the tuba in the Tortuguero and Sarapiquí drainages of Costa Rica and found it favours moderate to swift currents in rainforest streams, where it picks up sunken fruit and the film of algae and small organisms that grows on submerged surfaces. A long, open aquarium with directional flow, smooth stones and sunken wood suits it best.

Divide the layout by function

OATA recommends fine aquarium gravel or sand for American cichlids because many dig and sift the bottom, and notes that they may uproot or eat live plants. A plant-eating river cichlid will treat soft plants as food, so use artificial plants, or tough plants fixed to wood, if you want greenery. Stand heavy stones directly on the glass or on a protective base, never on top of the sand, so a digging fish cannot undermine them.

Leave the stones in good light so a film of algae can grow on them; it gives the fish something to graze between meals. Keep the layout simple enough to siphon around, because a large fish produces plenty of waste.

Set warm, clean water and keep it stable

FishBase gives pH 6.8–8.0, a hardness from 4 dH upwards (no upper limit is given) and a wide temperature range of 23–33°C. OATA's general range for American cichlids is 22–27°C. We suggest 23–27°C, where the two overlap; warmer water holds less oxygen, which matters for a fish from fast, oxygen-rich rivers.

Separate habitat values from waste readings

The waste limits come from OATA. Most UK tap water falls inside the pH range: much of southern and eastern England is hard and alkaline, while parts of Scotland, Wales and western England are soft. Check your water company's water-quality report, enter your readings in our water matcher, and read our water chemistry guide for what each reading means. Stability matters more than chasing an exact number, so avoid pH chemicals and match the temperature of every water change.

Filter for oxygen and steady flow

This fish comes from rivers with high water velocity, so treat oxygen and current as part of its basic care, not as extras. Seriously Fish's species profiles size filters at a turnover of four to five times the tank volume each hour; for a 337-litre aquarium that is roughly 1,350–1,700 litres per hour. Add a circulation pump to drive a current along the length of the tank, and keep the surface moving so oxygen can enter.

Follow a weekly maintenance sequence

1. Test ammonia, nitrite and nitrate before you change anything.
2. Change at least 25% of the water, the weekly figure OATA recommends, using conditioned water at the same temperature.
3. Siphon the sand and the spaces around stones, where uneaten vegetables and waste collect.
4. Check that the filter intake and circulation pump are clear and the current is as strong as usual.
5. Rinse filter media only in water removed from the aquarium, never under the tap, to protect the filter bacteria.

A plant-heavy diet produces plenty of waste, and leftover vegetables break down quickly in warm water. Our article on understanding aquarium filtration explains how to size and maintain a filter for a large fish.

Feed a plant-based diet with the occasional extra

FishBase lists aquatic plants, algae and fruit as the tuba's food, and notes that young fish are partial to aquatic insects. Winemiller and colleagues called it a specialised fruit feeder: the two wild fish they examined held only fruit and the tiny nematode worms that live among it, and they describe compact jaws with incisor-like front teeth suited to biting and tearing. Říčan and colleagues add that eating fruit is a feeding ecology otherwise unknown among Middle American cichlids.

Build one measured meal

• Staple: a plant-based cichlid pellet, such as Tropical Cichlid Herbivore Small Pellet, or Super Spirulina Forte Granulat.
• Grazing: Tropical Green Algae Wafers and the algae film on well-lit stones.
• Fresh greens: blanched courgette, peas or spinach, removed if still uneaten after a few hours.
• Frozen variety: Frozen Herbivore Fish Food as part of the weekly rotation.
• Occasional extras: small pieces of soft fruit, and small meaty foods for a young fish, kept as a minor part of the diet.

OATA advises feeding American cichlids only what they eat within a few minutes, once a day, and warns that they can eat a large amount at once. Overfeeding clouds the water and pushes up ammonia. Watch the belly: it should look gently rounded, not swollen. If the fish loses interest in food, test the water before changing the diet.

Introduce it to a mature aquarium

Add the fish only to an aquarium whose filter has matured, with ammonia and nitrite both at zero and the temperature and current already set. Our first tropical tank guide and the article on the nitrogen cycle explained show how to get there.

OATA describes the floating-bag method: switch the aquarium lights off, float the sealed bag for about 10 minutes so the temperatures match, add small amounts of aquarium water to the bag over up to 20 minutes, then release the fish with as little bag water as possible. Our guide on how to acclimatise new fish takes you through each step.

Use a first-week checkpoint plan

A new cichlid often hides at first and may show darker or paler colour than normal. That usually settles once it has claimed a spot. Rapid breathing at the surface is not normal: test the water and increase surface movement straight away.

Choose tank mates of similar size and strength

No published source gives a detailed temperament for this species, so plan as OATA advises for American cichlids in general: the more assertive species must be kept alone or with equally robust cichlids, and all American cichlids become more defensive when breeding. A territorial fish of 30 cm will claim a large part of the aquarium and can harm anything small enough to bully or swallow.

Screen each companion

Two companions have a real link to the tuba: Winemiller and colleagues recorded the blackbelt cichlid and the Nicaragua cichlid in the same Costa Rican river system. Our Black Belt Cichlid reaches 254 mm standard length according to Seriously Fish, which advises keeping it only with similarly aggressive fish of a similar size. The Nicaragua Cichlid is another candidate for the largest set-ups. The Redhead Quetzal Cichlid, a large Vieja from further north, belongs to a group that Říčan and colleagues class among the plant- and detritus-eating cichlids. Check any mix with our tank mates tool, and read our cichlid care guide for the principles that apply to every cichlid.

Watch for problems early

OATA describes a healthy fish as having clear, bright eyes, undamaged fins, intact scales, no ulcers or bumps, normal swimming and steady breathing. Learn what is normal for your tuba in its first month: where it rests, how strongly it swims into the current and how keenly it feeds.

Pair each sign with an action

Test first, then act: most changes follow a water-quality or temperature problem. Our article on tropical fish tank temperature explains how to keep the heater and thermometer reliable.

Understand breeding and its wild home

OATA notes that American cichlids are egg layers that clean a flat surface before spawning and then guard their young until the fry are free-swimming, and that their aggression when breeding means a dedicated set-up is needed. No published aquarium breeding account was found for the tuba cichlid, so a spawning would need a proven pair, a very large aquarium and a separate tank for any fry.

In the wild the tuba shares its rivers with other plant- and fruit-eating fish. Winemiller and colleagues suggest that by feeding in swift water it reaches sunken fruit and algae that smaller fish in the calm margins cannot. That specialisation is the reason to give it a current, clean water and a diet led by plants.

Answer Tuba Cichlid buying questions

What is a Tuba Cichlid?

It is Tomocichla tuba (Meek, 1912), a large Central American cichlid from fast-flowing rivers on the Atlantic slope of Nicaragua, Costa Rica and Panama. It was first described as Cichlasoma tuba, and it is one of the very few cichlids known to eat fallen fruit in the wild.

How big does a Tuba Cichlid grow?

FishBase records a maximum of 30 cm total length, measured from the snout to the tip of the tail. Plan the aquarium for a fish of that size, not for the young fish that arrives.

What size aquarium does it need?

No species-specific figure is published. OATA recommends at least 300 litres for American cichlids over 15 cm, and a long tank suits a river fish, so choose at least 300 litres on a base of 120 × 45 cm or more. A 150 × 50 × 45 cm aquarium, for example, holds about 337 litres.

What does a Tuba Cichlid eat?

Wild fish eat aquatic plants, algae and fallen fruit, and young fish also take aquatic insects. In the aquarium, base the diet on herbivore cichlid pellets and spirulina foods, add blanched vegetables, and keep meaty foods as an occasional extra.

What water conditions does it need?

FishBase gives pH 6.8–8.0, a hardness from 4 dGH and 23–33°C; OATA gives 22–27°C for American cichlids in general. Aim for 23–27°C, where the two overlap, with strong filtration, plenty of oxygen and zero ammonia and nitrite.

Which tank mates suit it?

Robust Central American cichlids of a similar adult size in a very large aquarium, such as the Black Belt Cichlid and the Nicaragua Cichlid, which were recorded in the same Costa Rican river system. Avoid small fish and timid community fish.

Is it the same fish as Tomocichla underwoodi or the Sieboldi cichlid?

Tomocichla underwoodi is an old name for the same species and is no longer used. The Sieboldi cichlid is a different fish, now Talamancaheros sieboldii, from the Pacific slope; Říčan and colleagues found the two are not close relatives.

How many fish come with one purchase?

One live Tuba Cichlid of the standard size currently available. It is a young fish, it is not sexed, and its colour will differ from the photographs.

Consult the care references

• FishBase: Tomocichla tuba — accepted name, maximum length, water values, distribution, river habitat, wild diet and conservation status.
• Eschmeyer's Catalog of Fishes: Tomocichla tuba — original name, type locality and the synonyms Tomocichla underwoodi and Theraps underwoodi.
• Říčan et al. 2016, Vertebrate Zoology 66(1): 1–102 — current classification of Middle American cichlids, genus definitions, distributions and feeding types.
• Winemiller et al. 1995, Environmental Biology of Fishes 44: 235–261 — field study of cichlid diets in Costa Rica, including the fruit-eating tuba cichlid.
• Seriously Fish: genus Vieja (aquarium-size comparison) — sizes, aquarium bases, water values and temperaments of Vieja species, used for comparison.
• Seriously Fish: Vieja maculicauda — the blackbelt cichlid: range, habitat, size, aquarium base and tank-mate advice.
• OATA: How to look after American cichlids — UK guidance on American cichlid water quality, aquarium size, décor, feeding, introduction and health checks.
• Tropical Fish Co delivery policy — current dispatch days and Live Arrival Guarantee terms.