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Care guide · Freshwater · fish

Agassiz's dwarf cichlid

Apistogramma agassizii

Agassiz's dwarf cichlid (Apistogramma agassizii)
Ornamental colour form; geographical origin unspecified. Photo: Cisamarc · Source · CC BY-SA 3.0Resized and compressed; no cropping or colour changes.

Agassiz's dwarf cichlid (Apistogramma agassizii) is a small fish with a strong interest in its own patch of substrate. A colourful male may search quietly among roots, while a female guarding a cave can suddenly become a determined defender. This changing behaviour makes the species fascinating, but less straightforward for a busy community aquarium. A suitable setup starts with floor space, cover and accessible feeding places. Origin matters too: a captive-bred colour form and a newly imported wild fish are not necessarily the same husbandry project. This guide separates everyday care, conditional companions and breeding requirements so that each can be considered properly.

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At a glance

Temperature
26–28 °C
pH
5.0–7.0
GH
0–10 °dGH
Aquarium length
At least 60 cm
Adult size
Approximately 5–7.5 cm
Group size
2 individuals
Temperament
Territorial

About this species

This species belongs to the Cichlidae. In the aquarium trade, Apistogramma agassizii includes different geographical and selectively bred forms. Research on populations around Iquitos has also demonstrated hidden biological diversity. Retain origin information and avoid casually mixing locality lines for breeding. A trade label or an unusually red tail does not, by itself, establish a different valid species.

Adult males are generally more colourful and develop longer fins than females. For space planning, allow approximately 5–7.5 cm standard length depending on sex; the tail fin is additional. Published measurements are not uniform, and some databases report smaller specimens. Those smaller figures are not a reason to reduce the aquarium size. Assess body condition and behaviour when buying fish. A small, pale individual is not necessarily female: age, stress and suppression can also affect appearance, especially among juveniles offered together.

Natural habitat

The described distribution covers parts of the Amazon basin from Peru into Brazil. Water colour and local conditions differ across that large area. For aquarium design, useful shared features are quiet marginal habitats, shelter and organic material along the bottom. Not every fish carrying this name therefore originates from the same kind of blackwater stream.

Do not create extremely acidic conditions simply because a habitat photograph shows dark water. Ask about collection locality or breeding line and the water in which the fish have recently lived. If origin is uncertain, a stable, mature aquarium is a better starting point than copying a specialised breeding technique. Leaves can add cover and natural substrate structure, but they are not a precisely dosed treatment that automatically delivers a particular pH. Check for accumulated waste without removing every secure shelter at the same time.

Aquarium and layout

A footprint starting at 60 × 30 cm is a planning basis for one carefully monitored pair, not for a fully stocked community. More females, several territories or additional bottom-dwelling fish require substantially more usable floor space. No apparently precise minimum volume is calculated here: a tall, narrow tank does not offer the same options as a wider aquarium with separated shelter zones.

Use fine, non-sharp substrate and several caves with protected entrances. Arrange wood and plants so that a chased fish can move out of sight without becoming trapped in a dead end. Two caves immediately beside each other do not create two independent safe territories. Java fern attached to wood can interrupt sightlines; leave its rhizome exposed and cave entrances open. Provide gentle movement with functioning biological filtration. Protect filter intakes if fry are expected. Have a practical means of separating fish ready before aggression causes injury, rather than relying on decoration alone to solve every dispute.

Water conditions

This guide uses 26–28 °C, pH 5–7 and GH 0–10 °dH as an evidence-based husbandry band, adjusted to known provenance. The bottom of the hardness range is not an instruction to use untreated pure reverse-osmosis water. Very low mineral content requires particular attention to stability and suitable preparation. Choose a steady position within the range instead of repeatedly moving between its limits.

Some wild populations are bred at pH 3–4. That is a specialised reproductive context, not general daily advice. Measurements from experimental systems are likewise not automatically optimal aquarium targets. A clean, stable system takes priority over chasing a number. Check temperature and water quality when behaviour changes, and base water changes on loading and measured trends. Persistent hiding may also reflect social pressure. Do not change temperature, acidity and furnishings simultaneously without first investigating the cause of the problem.

Behaviour and group size

This is not a schooling species. A male and female may live together, but purchasing a pair does not guarantee lasting tolerance. The male defends space, and a brooding female may drive even him away. A larger setup with several females requires separate, genuinely usable territories. Adding more fish is not a simple cure for aggression.

Beckford's pencilfish is linked only as a conditional companion. Shared conditions are around 26 °C, pH 6–7 and GH 5–10; the pencilfish need their own complete group and upper swimming space. The minimum pair aquarium is not automatically suitable for this combined stocking. Other dwarf cichlids or bottom fish may repeatedly enter the brood territory. Small shrimp and fish larvae may be eaten. Watch whether every fish feeds and reaches resting places. A community that appears peaceful outside spawning must be reassessed during parental care, with separation available if needed.

Feeding

Apistogramma agassizii mainly seeks small animal foods, including bottom-dwelling invertebrates in nature. Offer variety through suitable small live or frozen foods. An appropriate complete dry food can form part of the basic menu if the actual fish accept it. Small pellets are often accepted more readily than flakes; do not assume that a recently purchased fish will immediately eat everything taken by its companions.

The linked Supervit flake is therefore a conditional option: reduce particle size if necessary and let food reach the sheltered feeding area. Confirm swallowing, rather than merely seeing food disappear from the water. Dried Daphnia is supplementary only and does not replace a complete menu or suitable live foods. Feed shy individuals deliberately without depositing a pile inside their cave. Avoid a build-up of leftovers among leaves and wood. A rounded belly after one meal tells little about balanced nutrition over the longer term.

Breeding

The female deposits adhesive eggs inside a protected cavity and subsequently tends eggs and young. Reproductive research has documented this behaviour. Prepare a safe separation option and suitable first foods before spawning occurs. After fertilisation, the female may treat the male as an intruder. Do not wait for visible injuries when attacks are persistent.

One study at approximately 28 °C recorded hatching after about 48 hours. This is an observation under particular conditions, not a fixed timetable for every line. Follow larval development and offer first food when free-swimming fry can actually take it. They require small, accessible particles and protection from filter suction. Regular checking for leftovers and stable water quality remain essential. Small experimental tanks described in research should not become recommendations for permanent housing. Keep origin records with offspring so that locality forms are not unknowingly mixed when fish move between aquarists.

Sources & review

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

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