Care guide · Freshwater · fish

Sardine Cichlid

Cyprichromis leptosoma

Female sardine cichlid; photo: Regani, color adjustment by Togabi, Wikimedia Commons, public domain. Photo: Regani (photographer); later color adjustment by Togabi · Source · Public domain; released by the original photographer/copyright holder (PD-self)Resized and compressed; no cropping or colour changes.

The sardine cichlid (Cyprichromis leptosoma) spends much of its time in the middle and upper water and is best understood as a shoaling fish, not a solitary centrepiece. In Lake Tanganyika, this slender cichlid gathers in large shoals above rocky shores. In an aquarium it therefore needs length, a clear swimming lane and stable, hard alkaline water. It is generally peaceful, but that does not make it suitable for every community: fast or dominant companions may outcompete it at feeding time. Geographic colour forms also exist, and larger fish are sometimes sold as “Jumbo”. That label may refer to another species. This guide helps you identify ordinary C. leptosoma, plan an appropriate group and make cautious choices about breeding and companions.

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At a glance

Temperature: 24–25 °C
pH: 8.0–9.0
GH: 10–19 °dGH
Aquarium length: At least 120 cm
Adult size: Up to 12.5 cm
Group size: At least 8 individuals
Swimming zone: Middle, Surface
Temperament: Peaceful, Territorial

About this species

Cyprichromis leptosoma is a cichlid endemic to Lake Tanganyika. Its slender, streamlined body and upward-facing mouth suit picking small prey from the water column. Males are often more colourful and display, while females are usually more subdued and carry the eggs in their mouths after spawning. Colour alone does not establish a separate species; local populations can differ.

A key trade concern is the label “leptosoma Jumbo”. Specialist sources describe such fish as larger than the ordinary form and possibly a different species. Do not buy by colour name alone, and avoid mixing geographic forms if maintaining distinct breeding lines matters. FishBase records a maximum total length of 11 cm; Seriously Fish reports 12.5 cm standard length. Since the tail is included in the first measure and excluded from the second, these are not directly contradictory values.

Natural habitat

This species occurs only in Lake Tanganyika in East Africa. Its natural habitat is open water along rocky shores. Large shoals swim above the substrate and take zooplankton from the water. The key aquarium feature is therefore not a pile of rocks, but a long, open water column with secure structure around the edges.

An aquarium cannot reproduce the immense scale of the lake. Translate the ecology into practical care: give the shoal an uninterrupted swimming route, keep decor from blocking the entire middle layer and maintain stable water conditions. A bare, exposed tank is not ideal either; rocks can be placed below as long as fish cannot become trapped in tight passages. The species’ association with mineral-rich alkaline water supports hard-water care, but readings from one field site are not a complete husbandry recipe.

Aquarium and layout

Use a tank at least 120 cm long and around 45 cm wide as a robust starting footprint. Length matters more than extra height because these fish swim in open water. Dimensions alone do not determine safe stocking; filtration, net volume, layout and group structure all matter. Keep at least eight fish and leave a broad swimming zone through the middle and upper water. A secure lid is sensible because startled fish may jump.

Place rockwork mainly in stable groups along the back or ends, avoiding loose stacks that can shift. Other Tanganyika species require individual assessment. A calm rock-dweller such as the masked Julie may fit conditionally in a different zone, but it needs its own territory and adds to the system’s bioload. Avoid boisterous, aggressive or very fast fish. Provide effective biological filtration and moderate flow, while preserving the open swimming lane.

Water conditions

As a cautious overlapping range, use 24–25 °C, pH 8–9 and GH 10–19 °dH. Seriously Fish gives broader aquarium-care ranges, while FishBase reports field measurements from the lake. The overlap is a conservative summary of those sources, not proof that every value in the range suits every individual equally. Keep conditions stable and alkaline.

GH measures general hardness; KH is a different measure and cannot be inferred one-to-one. Monitor temperature, pH and hardness with reliable tests, and do not change them abruptly to chase a number. A mature filter, suitable stocking and regular water changes matter more than rapid correction. Keep ammonia and nitrite at zero and prevent food waste from collecting inside rockwork.

Behaviour and group size

Cyprichromis leptosoma is a social shoaling fish. A group of at least eight is the specialist starting point; larger groups need correspondingly more space and careful waste-load planning. Males display in open water and may defend small display areas. The species is described as peaceful, but it can suffer from continual chasing or food competition. Check that less dominant fish actually eat.

Mbuna and other boisterous or aggressive cichlids are poor choices. A calm Tanganyika rock-dweller can be considered only when zones, water conditions and the complete needs of both species fit together. The masked Julie (Julidochromis transcriptus) is included as a conditional guide relationship, not a guarantee. Do not mix geographic Cyprichromis forms, and treat “Jumbo” trade fish cautiously because of hybridisation risk and uncertain identity. Tankmates may eat small fry.

Feeding

In the lake this fish feeds on zooplankton. In an aquarium, offer small accessible particles and a varied menu that includes suitable frozen and live foods. Seriously Fish recommends these as an important part of the diet and notes that dry food is usually accepted. Its small mouth makes particle size important: a large pellet that falls to the bottom is not useful staple food.

Feed modest portions that all fish can reach. If needed, offer food in more than one place, but do not let it collect in rockwork. Watch the shoal during meals and look for thin fish or individuals that consistently fall behind. No existing shop product was individually checked for this species and appropriate particle size, so no product is attached as a recommendation.

Breeding

Courtship and spawning take place in open water. The female catches the eggs in her mouth and broods them there. Seriously Fish reports a small brood of roughly 5–20 eggs and a carrying period of up to about four weeks. These are species-profile observations, not a fixed promise for every group or breeding attempt. Leave a brooding female undisturbed where possible; unnecessary capture or artificial stripping is not needed for routine care.

A settled adult group and stable water are a better foundation than a rapid temperature or pH adjustment. Once released, fry need suitably small food particles and protection from filter intake and predation. Keep the breeding group adequately sized and avoid isolating a female from the social group for long periods. A guaranteed recipe or precise spawning temperature is not sufficiently supported and is not provided.

Sources & review

This care guide draws on several specialist sources and was last checked on 17 October 2026.

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