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Flag Acara (Smiling Cichlid)

Laetacara curviceps

The *Laetacara curviceps* (commonly known as Flag Acara or Smiling Cichlid) is the forgotten jewel of fishkeeping. Often ignored because of its dull juvenile coloration, this small Acara transforms into a breathtaking, stocky and robust adult fish, exhibiting a deep turquoise/teal body, dotted with silver, a firm black line along the eye and fins bordered in bright red. Less chemically demanding than Rams and decidedly less aggressive than Apistogramma, the Curviceps combines fantastic rusticity with an adorable temperament, being perhaps the calmest and most peaceful cichlid that can be housed in an 80 cm (30-inch) community aquarium.

Taxonomy
Class:Actinopteri
Order:Perciformes
Family:Cichlidae
Subfamily:Cichlasomatinae
Genus:Laetacara
Species:Laetacara curviceps

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Water Temperature

22 - 26 °C

pH Value

5.5 - 7.5

Water type

Freshwater

Tank level

Bottom and middle

Adult size

7 cm

Minimum tank volume

>= 80 L

Minimum group

>= 2

GH

1 - 10 dGH

KH

1 - 5 dKH

TDS

25 - 200 ppm

Conductivity

39 - 313 uS/cm

Species description

Geographical Origin and Habitat: Lower Amazon basin, Brazil (e.g. Tapajós tributaries). Populates the flooded margins, quiet areas with slow or stagnant waters (clear or blackwater) full of riparian or floating vegetation.
Taxonomy and Morphology: Flag Cichlid (Laetacara curviceps). Dwarf cichlid (maximum 7 cm / 2.7 inches) known as the "Smiling Acara". Moderately high body, curved head profile (curviceps) and upturned mouth.
Social Behavior: Incredibly shy and peaceful, perhaps one of the quietest dwarf cichlids. Stays hidden in small groups among the fronds, moving slowly. Rarely manifests aggression unless strictly around the eggs.
Coloration and Sexual Dimorphism: Beautiful but elusive. Cyan and light blue metallic reflections on a blue-gray/olive base, often with a dark zigzag lateral line. The fins are spotted with teal. When spawning, the belly turns purplish. Males slightly larger and more pointed.

Care, breeding and tankmates

Aquarium Setup: Needs constant visual covers. Densely planted aquariums (60-80 cm / 24-32 inches min) with abundant Salvinia or Pistia on the surface. Refuges formed by bogwood roots, coconut shells and dead leaves are essential to see it calm.
Diet and Feeding: Micro-predator and Insectivore. Grazes on small crustaceans and larvae from plant surfaces. In the aquarium it eats small-caliber dry food but must be regularly spoiled with live or frozen daphnia to show its flashes of color.
Water Quality: Prefers acidic waters (Ph 6.0) but resists well up to 7.5. Fundamental is the very slow flow, powerful wavemakers will exhaust them confining them to a corner of the tank.
Compatibility and Cohabitation: Excellent. Perfect with shy Tetras (Neon, Ember tetra), hatchetfish (Carnegiella) and very small loricariids. Tends to be submissive and not feed if paired with overly expansive Apistogramma or Ramirezi.
Aquarium Breeding: Open Spawner. They choose pre-cleaned round stones or large Echinodorus leaves. They lay up to 200 eggs; form a lasting pair that defends the offspring together (although often, in the first attempts, they devour them in prey to inexperience).
Risks and Diseases: Discoloration (Stress). In stores and tanks poor in shelters, the curviceps looks like an insignificant mud-gray fish. Only optimal home conditions will unlock the blue livery.

Geographic Origin and Distribution

Lower Amazon basin, Brazil (e.g. Tapajós tributaries). Populates the flooded margins, quiet areas with slow or stagnant waters (clear or blackwater) full of riparian or floating vegetation.

Origin

Amazon, Orinoco, and Guianas

Fish profile

Temperament
Peaceful
This is a generally peaceful dwarf cichlid that rarely bothers non-cichlid tank mates. They do become notably territorial when preparing to spawn or guarding their fry. Providing ample visual barriers and hiding spots ensures that any aggression is well mitigated.
Diet
Omnivore
They are omnivorous micro-predators that forage on benthic invertebrates and plant matter in the wild. In captivity, they readily accept sinking pellets, high-quality flakes, and granular foods. Live or frozen bloodworms, daphnia, and brine shrimp should be offered regularly for optimal health.
Sex ratio
Pair
Keeping them in compatible pairs is the most successful approach for long-term harmony. If kept in groups, multiple females per male can be housed in sufficiently large tanks to disperse aggression. During breeding, even a bonded pair will become highly territorial toward conspecifics.
Feeding frequency
Twice daily
Adults should be fed one or two small meals per day. Overfeeding can lead to obesity and rapidly degrade water quality in the aquarium. Fasting them for one day a week can closely mimic natural food availability and promote digestive health.
Bioload
Low to Medium
This dwarf cichlid has a moderate bioload that is easily managed in appropriately sized aquariums. They consume significant amounts of food but their small adult size limits overall waste production. Regular water changes and a high-quality biological filter will effortlessly maintain water stability.
Flow
Weak
They originate from slow-moving or stagnant waters in the Amazon basin. A gentle to moderate current is strongly preferred over strong, turbulent flow. Ensure that the filtration system does not create a vortex that exhausts these rounded fish.
Jump risk
No
Reproduction
Oviparous
They are biparental substrate spawners that typically lay their eggs on flat stones or broad leaves. Both parents fiercely defend the eggs and the resulting fry from potential predators. Soft, slightly acidic water and varied high-protein meals are usually required to trigger spawning.
Compatibility & tankmates
Peaceful
It is highly peaceful for a cichlid and does remarkably well in community setups. They should not be kept with overly aggressive or large predatory fish. Ideal tank mates include tetras, pencilfish, and peaceful bottom dwellers like Corydoras.
Tank level
Middle/Bottom
They predominantly inhabit the middle and lower regions of the aquarium. Providing plenty of driftwood, leaf litter, and flat stones makes them feel at home near the substrate. They will venture higher during feeding times but prefer the safety of the bottom.

Window to the official scientific data of the species

Data synced on: 06/15/2026

Scientific Parameters & Models

Trophic level
3.2 ± 0.4 se
Resilience
High (less than 15 months)
Phylogenetic uniqueness (PD50)
0.5078
Bayesian Length-Weight
a = 0.02188, b = 3.05
VulnerabilityLow vulnerability (10 / 100)

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

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Last updated: 06/30/2026
Flag Acara (Smiling Cichlid) (Laetacara curviceps) Care Guide & Tank Setup | Atlarium