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title: "Convict Cichlid: The Complete Care, Tank & Breeding Guide" description: "The definitive convict cichlid (Amatitlania nigrofasciata) care guide: tank setup, water parameters, managing aggression, feeding, the easiest cichlid to breed, and tank mates." slug: convict-cichlid commonName: Convict Cichlid scientificName: Amatitlania nigrofasciata family: Cichlidae order: Cichliformes difficulty: Beginner minTankSize: 30 temperature: "74–82°F (23–28°C)" ph: "6.5–8.0" hardness: "8–20 dGH" lifespan: "8–10 years" maxSize: "5 inches (13 cm)" origin: "Central America" publishedAt: "2026-06-04"

Convict Cichlid: The Complete Care, Tank & Breeding Guide

The convict cichlid is the fish that has taught more aquarists about cichlid behaviour — and cichlid aggression — than any other. Boldly barred in black and white (earning its prison-stripe name), tough as old boots, and so eager to breed that a pair will spawn in almost any conditions, Amatitlania nigrofasciata is the quintessential "starter" Central American cichlid. It is hardy and full of personality, but it is also genuinely aggressive and territorial, which makes tank-mate selection and tank size the central decisions of keeping one.

This guide is the complete reference: the convict's biology and famously bulletproof hardiness, how to set up its tank, the realities of its aggression, what to feed it, and why it is the single easiest cichlid in the hobby to breed (sometimes too easy).

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Species Overview

The convict cichlid (Amatitlania nigrofasciata, long known as Archocentrus or Cichlasoma nigrofasciatum) is a Central American cichlid reaching about 13 cm (5 inches) for males, with females a little smaller. Its name comes from the black-and-white vertical barring that stripes its grey-blue body. There is also a very common pink/white ("albino") strain, and an interesting sexing feature: females develop orange-to-gold patches on the belly and flanks, the opposite of the usual fish pattern where males are showier.

The convict is extraordinarily hardy, adaptable, long-lived (8–10 years), and bursting with personality — bold, intelligent, and interactive. It is also one of the most aggressive commonly-kept cichlids relative to its size, especially when breeding. This combination makes it an excellent first cichlid for someone who understands they're keeping an aggressive fish, but a poor choice for a peaceful community. It's most often kept as a species pair or with other robust Central American cichlids.

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Natural History and Origin

Amatitlania nigrofasciata is native to Central America — from Guatemala and Honduras to Costa Rica and Panama — living in warm streams, rivers, and lakes with rocky bottoms, moderate flow, and plenty of cover. It is a remarkably adaptable generalist, thriving across a wide range of conditions, which is exactly why it's so hardy in captivity (and why it has become an invasive species in warm waters around the world where it's been released — a reason never to release aquarium fish).

In the wild, convicts are substrate-spawning cichlids that form strong monogamous pairs and defend a territory around their nest with legendary determination, both parents fiercely guarding eggs and fry against all comers. This combination of adaptability, hardiness, and intense parental aggression is the essence of the species — and the reason it's both a fantastic beginner breeding fish and a challenging community member.

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Water Parameters

The convict cichlid is bulletproof by aquarium standards, tolerating a very wide range of temperature, pH, and hardness — part of why it's recommended for beginners and used in research. It prefers harder, neutral-to-alkaline water (reflecting its Central American origins) but adapts to most tap water in a cycled tank. Confirm cycling with the nitrogen cycle tracker and check values with the water parameters reference. Its hardiness does not excuse poor maintenance — it's messy, so good filtration and water changes still matter.

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Tank Setup Guide

Tank size

A pair needs a minimum of 30 gallons (115 litres), with 40+ gallons better, both for the fish and to give any tank mates room to escape the pair's territory. Convicts are active, messy, and territorial, so more space genuinely helps manage aggression and water quality.

Aquascape

Provide rockwork with caves and a flat spawning surface (a cave, flat rock, or overturned pot) — a pair will claim and defend one. Use a substrate they can dig (sand or gravel), as convicts are enthusiastic excavators that rearrange their territory and dig pits for fry. Plants are often uprooted, so use hardy, well-anchored species, plants attached to hardscape, or accept a hardscape-focused scape. Robust décor and broken sightlines help diffuse aggression in a community.

Filtration, flow, lid

Convicts are messy eaters and heavy waste producers, so use robust filtration and stay disciplined with water changes. Moderate flow suits them. A lid is sensible, as startled cichlids can jump.

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Managing Aggression

The convict's aggression is the defining husbandry challenge, and it must be planned for, not fought. The fish is territorial year-round and becomes intensely aggressive when breeding, when a pair will attack anything near their nest — including much larger fish and the keeper's hand. A bonded pair in a 30-gallon tank effectively claims the whole tank as their territory.

Strategies:

• Keep them as a species pair in their own tank — the simplest, most reliable approach.
• Or keep them only with other robust Central American cichlids in a large tank with abundant rockwork and broken sightlines.
• Don't keep them with small, peaceful, or slow fish — these will be bullied, injured, or killed, especially during breeding.
• Be ready to manage breeding aggression, which intensifies dramatically when fry are present.

Accept the convict for what it is — a bold, aggressive, fascinating little cichlid — and it's hugely rewarding; try to force it into a peaceful community and there will be casualties.

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Feeding Guide

Convict cichlids are unfussy omnivores with hearty appetites — among the easiest fish to feed.

What to feed

• Quality cichlid pellets — a complete staple.
• Frozen and live foods — daphnia, bloodworm, brine shrimp for variety and conditioning.
• Vegetable matter — some plant content (spirulina, blanched vegetables) for balance.

How often

Feed once or twice daily, only what's eaten quickly. Convicts will eat enthusiastically and can overeat, so feed sensibly and watch water quality given their waste output. A healthy convict is robust, boldly coloured, and active.

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Behavior and Temperament

Convict cichlids are bold, intelligent, and endlessly interactive — they dig, rearrange their territory, recognise their keeper, and (as a pair) display some of the most devoted parenting in the hobby. This personality is a big part of their appeal; a convict pair is genuinely engaging to watch.

The flip side is aggression. They are territorial and become formidable when breeding, defending their nest against all comers regardless of size. Within a pair, bonds are usually strong, though a mismatched or unready pair can fight, so provide caves and escape routes. Toward other fish, expect territoriality that ranges from bossy to lethal depending on space and tank mates. Understanding and respecting this behaviour is the key to keeping them successfully.

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Compatibility

The convict is best kept as a species pair or with robust tank mates that can handle its temperament.

Workable tank mates (large tanks, with caution): firemouth cichlid, other similarly-sized robust Central American cichlids, large plecos, and other tough fish that can hold their own — always in a spacious, well-structured tank.

Poor/dangerous tank mates:

• Small, peaceful community fish — bullied or killed.
• Long-finned or slow fish — harassed.
• Shy species — outcompeted and stressed.
• Anything kept with a breeding pair — at serious risk near the nest.

Honestly, the most reliable convict setup is a dedicated species tank for a pair. Use the compatibility checker and err toward robustness and space if attempting a community.

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Breeding Guide

The convict cichlid is the single easiest cichlid to breed — so easy it's used to teach cichlid breeding and is sometimes bred unintentionally. A male and female will pair off and spawn readily in almost any decent conditions.

Pairing: simply keep a male and female together with a cave or flat surface; they'll usually pair and spawn within weeks. Sexing: females develop orange/gold belly patches and are smaller; males are larger with longer fins and a steeper forehead with age.

The pair cleans a flat surface or cave and the female lays a clutch (often 100–300 eggs), which both parents guard ferociously. Eggs hatch in a few days, and the parents dig pits, move the wrigglers, and shepherd the free-swimming fry in a tight defended cloud — textbook biparental cichlid care that's wonderful to observe. Fry are easy to raise on baby brine shrimp, crushed flake, and microworms.

The catch is the flip side of how easy this is: a pair will spawn repeatedly (every few weeks), producing far more fry than most keepers can house or rehome. Be prepared to manage the offspring before you breed them, and never release them. For learning cichlid breeding and parenting behaviour, though, nothing beats a pair of convicts.

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Health and Disease

Convict cichlids are among the hardiest aquarium fish, and disease is uncommon with basic care.

Ich can follow temperature swings or stress; treat promptly. Bacterial and fungal infections follow poor water or fighting injuries. Bloat / digestive issues can occur with poor diet or overfeeding. Injuries from aggression — torn fins, wounds from fighting or a bad pairing — are the most species-specific concern; provide space, cover, and appropriate tank mates to minimise them.

Prevention is easy: a cycled, stable tank with robust filtration (they're messy), a varied diet in moderation, appropriate (robust) tank mates or a species setup, and water changes to handle their waste. Given their legendary hardiness, convicts are about as trouble-free as fish get — the main "problems" are behavioural, not medical.

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Interesting Facts

• Females wear the colour. Unusually, female convicts develop the orange-gold belly patches, making them the more colourful sex — handy for sexing.
• The easiest cichlid to breed. A pair spawns so readily and parents so reliably that convicts are a standard teaching species for cichlid breeding.
• Bulletproof and invasive. Their extreme adaptability makes them nearly indestructible in the tank — and an established invasive species in warm waters worldwide where released, so never release them.
• Devoted parents, fierce defenders. Both parents guard eggs and fry with determination wildly out of proportion to their size.
• A research favourite. Their hardiness and predictable behaviour have made convicts a model species in studies of fish aggression and pair bonding.

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Bringing It Together

The convict cichlid is the bold, bulletproof, intensely characterful fish that teaches the realities of cichlid keeping — personality, pair bonding, devoted parenting, and genuine aggression — all in a hardy package that thrives in almost any decent water. Give it a 30-gallon-plus tank with rockwork, caves, a flat spawning site, a substrate to dig, robust filtration, and either a species-only setup for a pair or only robust Central American tank mates with plenty of space — and respect its territorial, breeding-driven aggression — and it rewards you with one of the most engaging fish in the hobby, very possibly raising brood after brood of fiercely-guarded fry. Just be ready to manage those fry, and never release them. Plan the build with the AI Tank Blueprint generator and the compatibility checker, and compare the bluffing, slightly gentler firemouth cichlid and the big, bold oscar fish for other New World cichlid options.