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Gephyra Apisto

Apistogramma gephyra

A striking dwarf cichlid from the Rio Negro, celebrated for the male's bright red dorsal fin edge. It requires extremely soft, acidic blackwater and a well-structured habitat to thrive.

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

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Water Temperature

24 - 27 °C

pH Value

4.5 - 6

Water type

Freshwater

Tank level

Bottom

Adult size

7.5 cm

Minimum tank volume

>= 80 L

Minimum group

>= 2

GH

1 - 5 dGH

KH

1 - 3 dKH

TDS

25 - 105 ppm

Conductivity

39 - 164 uS/cm

Species description

Geographical Origin and Habitat: This species is native to South America, specifically distributed in the upper and middle Rio Negro basin in Brazil. It inhabits small tributaries, secondary channels (igarapés), and flooded areas of the rainforest. Its habitat is characterized by blackwater or clearwater, warm, extremely soft, and acidic, with substrates covered in thick layers of decaying leaves and fallen branches.
Taxonomy and Morphology: Belonging to the family Cichlidae, subfamily Geophaginae. Described by Sven Kullander in 1980, it is closely related to Apistogramma agassizii, with which it is often confused. It differs from the latter by having a rounder caudal fin (not spade-shaped) and the presence of a distinct light or reddish submarginal band on the tail. Males reach 5 cm, while females are smaller.
Social Behavior: It is a territorial but generally peaceful species toward fish of other families. It exhibits a cave-spawning reproductive behavior. The female takes almost exclusive responsibility for the care of the eggs and fry, vigorously defending the nest against any intruder, while the male patrols the larger surrounding territory.
Coloration and Sexual Dimorphism: Males display a beautiful iridescent blue-silver body color on the flanks, with a well-defined dark longitudinal stripe and yellow and reddish hues on the head and fins. The dorsal fin has a bright red upper edge (hence the common name 'Redseam dwarf cichlid'). Females exhibit a bright yellow coloration during the breeding period.

Care, breeding and tankmates

Aquarium Setup: Requires a species-specific or community aquarium of at least 60-80 liters (approx. 15-20 gallons) for a pair. The setup must include a fine, dark sand substrate, driftwood, and plenty of dried leaves (such as Catappa or oak leaves) to recreate the natural rainforest floor. It is essential to include caves, coconut shells, or small clay pots.
Diet and Feeding: Lighting should be shaded by dense floating vegetation to reduce light intensity and make the fish feel secure. The water temperature must be kept stable between 24°C and 28°C (75-82°F). Heating should be managed with a reliable heater equipped with a thermostat to avoid harmful thermal fluctuations.
Water Quality: The water must be extremely soft and acidic: pH between 5.0 and 6.0, general hardness (GH) below 4 dGH, and KH close to zero. The use of reverse osmosis water is almost mandatory, enriched with tannins from peat or leaves. Filtration must be efficient but with a very slow water flow to avoid strong currents.
Compatibility and Cohabitation: A micro-predator. The diet should consist mainly of small frozen or live foods such as brine shrimp, mysis, daphnia, cyclops, and bloodworms. It can be gradually accustomed to high-quality dry granulate feeds, but to stimulate breeding and maintain bright colors, it is essential to offer fresh food.
Aquarium Breeding: Compatible with small, peaceful characins (tetras), pencilfish (Nannostomus), Corydoras, and small bottom dwellers. During the breeding period, the pair (and especially the female) becomes highly territorial and aggressive toward other bottom residents; ensure there are sufficient visual barriers and hiding places.
Risks and Diseases: The species is highly sensitive to nitrate accumulation and any organic pollutants; regular and frequent partial water changes are necessary. Inadequate water chemistry (high pH or excessive hardness) will inhibit breeding and cause severe stress, exposing the fish to fungal infections and ectoparasites.

Geographic Origin and Distribution

This species is native to South America, specifically distributed in the upper and middle Rio Negro basin in Brazil. It inhabits small tributaries, secondary channels (igarapés), and flooded areas of the rainforest. Its habitat is characterized by blackwater or clearwater, warm, extremely soft, and acidic, with substrates covered in thick layers of decaying leaves and fallen branches.

Origin

Amazon, Orinoco, and GuianasNorth America

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
Gephyra Apisto (Apistogramma gephyra) Care Guide & Tank Setup | Atlarium