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Red-line dwarf cichlid

Apistogramma rubrolineata

A captivating dwarf cichlid from the Amazon basin, distinguished by the striking horizontal red stripes along the male's flanks. It is a peaceful species needing soft, acidic blackwater.

Taxonomy
Class:Actinopteri
Order:Perciformes
Family:Cichlidae
Subfamily:Cichlinae
Genus:Apistogramma
Species:Apistogramma rubrolineata

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Water Temperature

22 - 28 °C

pH Value

5.5 - 6.5

Water type

Freshwater

Tank level

Bottom

Adult size

6.5 cm

Minimum tank volume

>= 60 L

Minimum group

>= 2

GH

2 - 8 dGH

KH

1 - 4 dKH

TDS

40 - 160 ppm

Conductivity

63 - 250 uS/cm

Species description

Geographical Origin and Habitat: This species is native to the Amazon basin, specifically the Madre de Dios River system in Peru and Bolivia. It inhabits slow-moving forest streams, shaded creeks, and shallow shorelines dense with leaf litter, where the water is extremely soft, acidic, and stained tea-color with organic tannins.
Taxonomy and Morphology: Belongs to the family Cichlidae, subfamily Geophaginae. It is a small cichlid with an elongated body; males reach about 5.5 cm in length, whereas females remain smaller, topping out around 3.5 cm. It is characterized by parallel horizontal red lines running along the flanks of mature males.
Social Behavior: A territorial yet generally peaceful species when kept with non-conspecific fish of similar size. Males establish individual territories that they defend vigorously, especially during the spawning phase. Keeping them in pairs or small harems is highly recommended in appropriate aquariums.
Coloration and Sexual Dimorphism: Sexual dimorphism is highly pronounced. Males are larger, with longer and more pointed dorsal and anal fins, displaying brilliant coloration with characteristic red stripes and blue iridescent scales. Females are smaller and mostly greyish-yellow, but turn bright yellow with black patterns when breeding.

Care, breeding and tankmates

Aquarium Setup: Requires a tank of at least 60-80 liters for a pair. The ideal substrate should be fine, dark sand, with an abundance of hiding places such as driftwood, roots, coconut shells, and smooth rocks forming caves. Adding dried catappa leaves helps replicate the natural humic conditions of their habitat.
Diet and Feeding: A carnivorous species that prefers live or frozen foods such as brine shrimp, bloodworms, daphnia, and copepods. They can be accustomed to high-quality dry micro-granules designed for dwarf cichlids, but a varied diet rich in fresh foods is essential to stimulate breeding and maintain vibrant colors.
Water Quality: Demands clean, soft, and acidic water. Ideal parameters are: temperature between 23 and 28 °C, pH range of 5.0 to 6.5, general hardness GH below 5 dGH, and carbonate hardness KH below 3 dKH. Nitrate and phosphate levels must be kept close to zero through regular, small water changes.
Compatibility and Cohabitation: Excellent occupant for geographical community aquariums. Cohabits well with small characins (such as pencilfish or tetras) that act as dither fish in the upper water column. Avoid highly active or aggressive bottom-dwellers (like large loaches or catfish) that might invade their territory.
Aquarium Breeding: Cave spawners. The female deposits eggs inside a cave or cavity and takes sole responsibility for guarding the clutch and fry, while the male patrols the outer territory. Very soft, acidic water (pH around 5.5) is absolutely crucial for the eggs to hatch successfully.
Risks and Diseases: Highly sensitive to poor water quality and the accumulation of organic waste, which can trigger hole-in-the-head disease or bacterial infections. They are also vulnerable to intestinal parasites and ich. Avoid sudden parameter shifts and closely monitor water chemistry.

Geographic Origin and Distribution

This species is native to the Amazon basin, specifically the Madre de Dios River system in Peru and Bolivia. It inhabits slow-moving forest streams, shaded creeks, and shallow shorelines dense with leaf litter, where the water is extremely soft, acidic, and stained tea-color with organic tannins.

Origin

Amazon, Orinoco, and Guianas

Fish profile

Temperament
Territorial
Overall, they exhibit a peaceful demeanor towards other species, but they are known to be territorial among their own kind. During the breeding season, both sexes become fiercely protective of their spawning sites and fry, potentially showing aggression to any intruders. Outside of breeding, they are somewhat shy and require a complex environment with plenty of hiding spaces to feel secure. Creating distinct visual barriers helps manage their territorial nature.
Diet
Carnivore
In their natural habitat, they are micro-predators that sift through the substrate for small invertebrates, insect larvae, and zooplankton. In captivity, they should be offered a varied and high-quality diet consisting of sinking micro-pellets and flakes. Supplementing their diet regularly with live or frozen foods like daphnia, baby brine shrimp, and bloodworms will promote optimal health and vibrant coloration. Variety is key to preventing nutritional deficiencies.
Sex ratio
Harem
In a suitably sized aquarium, they are best maintained in a harem configuration consisting of one dominant male and several females. If the tank is on the smaller side, maintaining a single compatible pair is the safest approach to minimize intraspecific aggression. Keeping multiple males usually requires a very large footprint with complex hardscape to break lines of sight and establish distinct territories. Proper sex ratios are vital for a peaceful tank.
Feeding frequency
Twice daily
It is highly recommended to feed them small portions once or twice daily to maintain their metabolism and overall well-being. Care must be taken to only offer an amount they can completely consume within a couple of minutes to avoid fouling the water. Overfeeding is a common mistake that can lead to severe water quality issues. Fasting the fish for one day per week can also help clear their digestive tract.
Bioload
This species has a relatively low bioload compared to larger cichlids, making it suitable for appropriately sized setups. However, they are highly sensitive to deteriorating water conditions and elevated nitrates. Maintaining pristine water quality through adequate filtration and regular water changes is absolutely crucial for their long-term health. A heavily planted tank can also help absorb excess nutrients and keep the environment stable.
Flow
Stagnant
Originating from slow-moving streams, backwaters, and sluggish tributaries, they strongly prefer gentle water flow in the aquarium. Strong currents will cause them undue stress and force them to expend unnecessary energy just to maintain their position. Filtration should be baffled if necessary to provide a calm environment, particularly near the substrate where they spend most of their time. Mimicking this natural calm flow is essential for their comfort.
Jump risk
No
Reproduction
Oviparous
They are typical cave spawners, utilizing secluded crevices, leaf litter, or natural hollows to lay their eggs. The female assumes the primary responsibility of guarding the eggs and the subsequent fry, often becoming highly reclusive. The male's role involves defending a larger peripheral territory against any perceived threats. Providing plenty of hiding spots like coconut caves, PVC pipes, and dense vegetation is critical for successful breeding.
Compatibility & tankmates
They are best kept in a species-specific aquarium or a peaceful community tank with small, non-aggressive dither fish like tetras or rasboras. Fast-swimming or boisterous tank mates should be avoided as they will easily outcompete this species for food and induce stress. Bottom-dwelling species such as Corydoras might face territorial disputes, especially if breeding behaviors commence. Careful selection of tank mates is necessary to ensure a harmonious environment.
Tank level
Bottom
These fish primarily inhabit the lower third of the water column, spending the vast majority of their day navigating the substrate. They are often seen foraging among leaf litter, driftwood, and plant roots in search of food. They rarely venture into the upper levels of the aquarium unless enticed by feeding or if they lack sufficient cover below. A well-structured bottom layout is highly appreciated.

Window to the official scientific data of the species

Data synced on: 06/15/2026

Scientific Parameters & Models

Trophic level
3.3 ± 0.4 se
Resilience
Medium (1.4 - 4.4 years)
Phylogenetic uniqueness (PD50)
0.5
Bayesian Length-Weight
a = 0.0182, b = 2.99
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
Red-line dwarf cichlid (Apistogramma rubrolineata) Care Guide & Tank Setup | Atlarium