Convict Cichlid Care Guide: Size, Breeding, Diet & Sexing

Based on original hands-on breeding notes by Melissa for Aqua-Fish.Net · Updated September 2026

Convict cichlid (Amatitlania nigrofasciata)

Pink or white Convict cichlid colour form

Quick answer: The Convict Cichlid (Amatitlania nigrofasciata) is a hardy, intelligent Central American cichlid, but it is not a peaceful community fish. Adults are usually around 8-12 cm, with males larger than females; large aquarium males can appear bigger depending on strain and how length is measured. A bonded pair needs a tank with a base of roughly 90 × 30 cm or larger, caves and broken sight-lines. Keep them around 24-28°C (75-82°F), feed a varied omnivorous diet, and expect serious territorial aggression once breeding begins. They are exceptionally easy to spawn and exceptionally good parents.

Scientific nameAmatitlania nigrofasciata

Other namesConvict fish, Zebra cichlid, Black Convict

Adult sizeUsually about 8-12 cm; males larger

Temperature24-28°C for routine aquarium care

pHAbout 6.0-8.0

HardnessAbout 5-25 dGH

DietOmnivorous

BreedingPair-forming, biparental cave/substrate spawner

The difficult part is not breeding them. It is managing what happens after they breed.

A pair that was tolerating tank mates yesterday can claim most of the aquarium after spawning. Convicts will defend eggs and fry against fish much larger than themselves. If you want to watch their parental behavior safely, a species tank for one pair is usually the cleanest solution.

Convict Cichlid Name, Taxonomy and Natural Range

The current accepted scientific name is Amatitlania nigrofasciata. Older aquarium books and articles often use Archocentrus nigrofasciatus, Cryptoheros nigrofasciatus or Cichlasoma nigrofasciatum. Those names explain why older Convict Cichlid information can look inconsistent even when it is discussing essentially the same aquarium fish.

There is another important historical complication. Older references treated the “Convict Cichlid” as a much more widely distributed Central American fish. After taxonomic work split several regional forms into separate species, FishBase now restricts true A. nigrofasciata mainly to drainages in El Salvador, Guatemala and Honduras. Older claims extending the species itself through Nicaragua, Costa Rica and Panama often reflect populations now assigned to other Amatitlania species.

In nature, Convicts occur in streams, rivers and spring-fed habitats, often around rock, roots, debris and crevices that provide cover. Their natural diet includes worms, crustaceans, insects, small fish and plant material.

Are Convict Cichlids African?

No. Despite how often “African convict fish” appears in searches, the true Convict Cichlid is a Central American cichlid.

How Big Do Convict Cichlids Get?

FishBase records a maximum of about 10 cm standard length for A. nigrofasciata. Standard length does not include the tail fin, so the total visible length of a large aquarium male is greater. Aquarium literature often reports large males in the 12-15 cm range, while females remain smaller.

This is one reason different care guides appear to disagree about size: some quote standard length, some quote total length, and domestic aquarium strains do not all grow identically. For practical tank planning, treat a mature male as a solid, territorial cichlid rather than as a “small 8 cm fish”.

Think approximately 10-12 cm for an adult fish, with large males potentially appearing bigger. Tank footprint and territory matter more than chasing one exact centimetre figure.

There is no useful universal “centimetres per month” growth rule. Growth depends on temperature, feeding, genetics, water quality and stocking. Convicts can mature while still relatively small; a field study of an introduced population found females reaching first maturity at only about 32 mm standard length.

Male vs. Female Convict Cichlid

Adult Convicts are among the easier cichlids to sex, but the most useful signs are not the vague “pointier fin = male” rules repeated across the web.

Feature	Male	Female
Adult size	Usually larger and more elongated	Usually smaller and deeper-bodied
Ventral colour	Usually lacks the strong orange abdominal patch	Characteristic orange/red-gold patch on the lower belly, especially obvious when mature
Dorsal / anal fins	Often longer and more pointed in mature males	Usually shorter and rounder
Nuchal hump	May develop in older, dominant males	Normally absent
Breeding colour	Bars and overall contrast may intensify	Orange ventral colour often becomes particularly vivid

The female's orange ventral coloration is not just hobby folklore. It has been studied scientifically as a sexually dimorphic signal in Convict Cichlids. In other words, Melissa's old practical description of the brighter female was on solid ground.

Convict Cichlid Tank Size and Setup

A pair needs territory more than it needs decorative empty litres. A base around 90 × 30 cm is a reasonable minimum for a pair; a wider 90 × 45 cm footprint gives considerably more useful space. If you want other cichlids in the aquarium, the tank needs to be substantially larger and even then compatibility is never guaranteed once the Convicts spawn.

Build the aquarium around the way Convicts actually behave:

Provide at least one proper cave, clay flower pot, rock overhang or similar spawning site.
Use rocks and wood to break lines of sight.
Leave some open substrate for digging.
Do not expect carefully rooted delicate plants to remain where you planted them.
Secure rocks so excavation cannot undermine unstable piles.
Use strong filtration and regular partial water changes; breeding pairs and growing fry create a lot of waste.

From Melissa's breeding notes: the flower-pot effect

Two Convict pairs had been kept for about a month without spawning. A flower pot was added and eggs appeared the following day. That timing may have been coincidence, but the observation is completely consistent with what we now know: Convicts strongly prefer defensible cavities and cleaned hard surfaces as spawning sites.

Temperature and Water Parameters

Parameter	Practical range
Temperature	24-28°C (75-82°F) for routine long-term aquarium care
pH	About 6.0-8.0; neutral to slightly alkaline is easy to manage
Hardness	About 5-25 dGH
Ammonia	0 mg/L
Nitrite	0 mg/L

Wild populations occur across a wider environmental range than we need to imitate in captivity. The better husbandry strategy is stable, clean water with adequate oxygen rather than repeatedly adjusting pH or temperature to hit one “perfect” number.

What Do Convict Cichlids Eat?

Convict Cichlids are opportunistic omnivores. Wild diet records include worms, crustaceans, insects, fish and plant material. In the aquarium, a quality cichlid pellet or granule is an excellent staple, supplemented with varied foods rather than one favorite treat.

Food type	Examples
Prepared staple	Quality cichlid pellets, granules or flakes
Frozen / live foods	Artemia, Daphnia, mysis, bloodworms and other appropriately sized invertebrates
Plant component	Spirulina-based foods and suitable vegetable matter

The old Aqua-Fish article mentioned frozen beef heart as a favorite. Convicts certainly may eat it, but terrestrial mammal meat is unnecessary and should not be promoted as a routine staple. A varied diet based on appropriate prepared fish foods and aquatic invertebrates is easier to balance.

Aggression, Pairing and Tank Mates

Convict Cichlids are territorial at the best of times and can become dramatically more aggressive when guarding eggs or fry. Calling them “hardy beginner fish” is therefore only half the story: they are easy to keep alive, but not necessarily easy to keep with other fish.

A bonded pair can work beautifully in a species tank. In a community aquarium, however, breeding changes the social map overnight. A pair may claim a cave, the surrounding substrate and a large section of open water, forcing every other fish into the remaining corner.

From Melissa's tanks: when the pair took over

After one pair spawned, the other Convict pair had to be removed because the parents became intensely defensive. The male repeatedly dug pits, uprooted plants and moved the fry under gravel and into new hiding places. This was not unusual behavior—it is classic Convict parental care expressed in a real aquarium.

If tank mates are attempted, choose robust Central American cichlids of comparable size only in a substantially larger aquarium with multiple territories and visual barriers. Even then, keep a divider or spare tank available. Small peaceful community fish are poor companions, especially once spawning begins.

Breeding Convict Cichlids: What Actually Happens

Convicts are substrate and cavity spawners that form a pair and share parental care. They are so easy to breed that the main challenge is usually managing aggression and finding homes for the offspring.

Provide a cave or other protected hard surface. Clay flower pots work exceptionally well because they create a dark, defensible cavity with a restricted entrance. The pair will clean the chosen surface, intensify their coloration and defend the site.

A pair forms. Courtship contains displays, chasing and ritualized aggression before the fish settle into a breeding partnership.
The nest is selected and cleaned. Caves, flower pots, rock faces and sheltered hard surfaces are common choices.
The female lays adhesive eggs. The male follows and fertilizes them.
The female usually concentrates on the eggs. She fans and cleans them while remaining close to the nest.
The male usually patrols the territory. He drives intruders away, although both parents can perform both roles.
After hatching, the wrigglers are moved. Parents may carry them in their mouths to pre-dug pits in the substrate.
Once free-swimming, the brood stays close to the parents. Both adults continue defense and herding behavior for weeks.

That division of labor is not just an aquarium impression. Behavioral studies show the same broad pattern: males spend more time on perimeter defense while females spend more time directly attending the brood, but the roles are flexible and can temporarily switch.

Are Convict Cichlids monogamous?

They form strong breeding pairs and provide biparental care, but “monogamous for life” is too strong. Research describes serial monogamy and shows that pair coordination can improve when the same partners remain together across successive broods.

Convict Cichlid Eggs, Hatching Time and Fry Stages

FishBase gives a typical clutch of roughly 100-150 eggs, while aquarium reports and behavioral studies show that larger clutches around 200-300 can also occur. Female size, age, condition and breeding history all affect fecundity.

Day 0Eggs are laid on a cleaned hard surface and fertilized.

About day 3-4Eggs hatch into non-swimming “wrigglers”.

Next 4-7 daysLarvae remain in pits while the yolk sac is absorbed; parents may move them repeatedly.

ThenThe fry become free-swimming and begin feeding while still guarded by both parents.

What do fertile Convict Cichlid eggs look like?

Fresh viable eggs are usually translucent to grey-brown or amber rather than chalky white. Eggs that turn opaque white are commonly unfertilized or have begun to deteriorate and may develop fungal growth. The parents often remove bad eggs themselves.

A small number of white eggs does not mean the whole spawn has failed. Watch the clutch over the next few days; developing eggs remain clearer and eventually show darker embryonic structures.

Raising Convict Cichlid Fry

Once the fry are free-swimming they are large enough to accept a range of small foods. Newly hatched brine shrimp are excellent, as are microworms, finely powdered quality cichlid food and finely crushed flakes.

Feed small meals several times per day without allowing uneaten food to accumulate. A growing brood can change the biological load of the aquarium very quickly, so maintain excellent filtration and use regular partial water changes.

Do not assume that the parents must be removed immediately. One of the reasons Convicts are such interesting fish is that their parental care is unusually visible and elaborate. In a species tank, the adults can normally remain with the brood while you observe the full sequence of guarding, herding and pit-moving behavior.

What Melissa observed with free-swimming fry

The parents repeatedly hid the young in excavated areas and moved them whenever they perceived danger. The male was especially destructive to planted areas because he kept digging new protective pits. That seemingly chaotic landscaping was actually part of brood defense.

Black, Zebra, Pink, White and Gold Convict Cichlids

The normal wild-type fish is the familiar grey-blue Convict with strong black vertical bars. “Black Convict” and “Zebra Convict” are common trade names for this form.

A pale captive-bred form is sold as the Pink Convict, White Convict or sometimes Gold Convict. It is the same species and has the same territorial behavior and care requirements. The pale form is generally described as leucistic rather than a true red-eyed albino.

The old Aqua-Fish article stated that the pale strain was harder to breed than the striped form. We would no longer present that as a general rule. Once a compatible pair forms, pale Convicts reproduce in the same basic way as wild-type fish.

Convict Cichlid Frequently Asked Questions

How big do Convict Cichlids get?

FishBase records up to about 10 cm standard length. In aquariums, large males are often described around 12 cm total length and occasionally larger. Females are normally smaller.

How do you tell a male Convict Cichlid from a female?

Females are usually smaller and show a distinctive orange or reddish-gold patch on the belly. Males tend to grow larger with longer pointed dorsal and anal fins, and older males may develop a nuchal hump.

What do Convict Cichlids eat?

They are omnivores. Use quality cichlid pellets or granules as the staple and add live or frozen invertebrate foods plus some plant-based foods for variety.

Are Convict Cichlids aggressive?

Yes. They are territorial even outside breeding, and a pair guarding eggs or fry can become extremely aggressive toward tank mates several times their own size.

How do you breed Convict Cichlids?

Provide a compatible male and female, clean stable water, a varied diet and a defensible cave such as a clay flower pot. In many cases that is all that is required. The bigger problem is managing aggression and the resulting fry.

How long do Convict Cichlid eggs take to hatch?

Usually about 3-4 days at normal aquarium temperatures. The larvae then remain as wrigglers for several more days before becoming free-swimming.

How can I tell if Convict Cichlid eggs are fertilized?

Developing eggs generally remain translucent, greyish or amber. Eggs that become opaque white are commonly unfertilized or deteriorating. Parents often remove failed eggs.

How often do Convict Cichlids breed?

There is no fixed aquarium interval, but healthy pairs are capable of repeated broods and can spawn multiple times in a year. Do not encourage constant spawning unless you already have a plan for the juveniles.

How fast do Convict Cichlids grow?

Growth varies too much for a reliable centimetres-per-month rule. They mature surprisingly early and at a small size, so young fish can begin pair formation before they look fully grown.

How long do Convict Cichlids live?

Published wild-population data and hobby lifespan claims do not line up neatly. One studied introduced population had a maximum sampled age of three years, while captive hobby literature often reports longer lives. It is safest to describe them simply as a multi-year commitment rather than promise one exact lifespan.

Are pink, white and gold Convicts different species?

No. These are captive colour forms of Amatitlania nigrofasciata. Their basic husbandry, aggression and breeding behavior are the same as the striped form.

Are Convict Cichlids African cichlids?

No. They are Central American cichlids. The confusion probably comes from the enormous popularity of African cichlids in the aquarium trade.

Convict Cichlid Pictures

References and further reading

This revision deliberately keeps the original Aqua-Fish breeding observations while checking biological claims against current specialist and scientific sources. Useful references include FishBase: Amatitlania nigrofasciata, Seriously Fish: Convict Cichlid, Snekser et al.: division of parental roles in Convict Cichlids, Laubu et al.: pair bonds and biparental care, Beeching et al.: female ventral coloration, and Ishikawa & Tachihara: life history, growth and maturity.

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