Overview
The Amapa Glow Tetra (Hyphessobrycon amapaensis) is a relatively rare but highly sought-after freshwater fish in the aquarium hobby. Revered for the glowing red line that runs horizontally across its body, this tiny characin brings a vibrant energy to planted tanks. They are hardy, peaceful, and make an exceptional addition to South American biotope setups or any harmonious community aquarium.
Distribution and Habitat
As its name suggests, this species is endemic to the state of Amapá in northern Brazil. It is predominantly found in small, slow-moving savanna creeks and tributaries. These natural waters are typically stained with tannins from decaying organic matter, featuring sandy substrates covered in fallen leaves, branches, and submerged roots. The water is generally soft and slightly acidic.
Description of Amapa Glow Tetra
Body shape:
The Amapa Glow Tetra features a classic tetra profile. It has a laterally compressed, somewhat fusiform (torpedo-like) body that allows it to dart quickly through the water column.
Color:
The base color of the body is a silvery-grey to pale olive. Its most defining feature is a brilliant, iridescent red lateral stripe that runs from the gill cover to the caudal peduncle. This red line is immediately underlined by a distinct, thinner black stripe, creating a striking contrast.
Barbels:
Like other characins, this species does not possess any barbels.
Snout:
It has a relatively short snout with a small, terminal mouth, perfectly adapted for picking micro-organisms and small foods from the middle of the water column.
Eyes:
The eyes are proportionally large. The upper half of the iris often features a distinct red or orange accent that matches its lateral stripe.
Fins:
The fins are mostly translucent or clear. In well-conditioned adult males, you might observe subtle white tips on the anal and pelvic fins.
The Tail:
The caudal fin (tail) is deeply forked and completely transparent, allowing the vibrant body colors to stand out even more.
Temper
This is an exceptionally peaceful species. They do not nip fins or bother other tank mates, making them ideal residents for a community tank featuring other small, docile species.
Sociality
Amapa Glow Tetras are highly gregarious schooling fish. They must be kept in groups of at least 6 to 8 individuals, though schools of 10 or more are highly recommended. A larger school reduces stress, encourages natural behaviors, and results in a much tighter, more visually impressive schooling display.
Activity
They are very active mid-water swimmers. Throughout the day, they will constantly dart around the aquarium, exploring plants and interacting with one another in playful, non-harmful sparring among males.
Keeping and Caring for Amapa Glow Tetra
Tank size:
A minimum tank size of 15 gallons (approx. 60 liters) is required to accommodate a small school and provide adequate swimming space. For larger schools, a 20-gallon long tank or larger is preferred.
Water Parameters:
Temperature
Maintain the water temperature between 23-28°C (73-82°F) for optimal health and metabolic function.
pH
They thrive in slightly acidic to neutral water, with a pH range of 5.5 to 7.0 being ideal.
Hardness
Soft water is preferred, generally between 2 and 10 dGH.
Ammonia, Nitrite, Nitrate
As with all fish, Ammonia and Nitrite must strictly be at 0 ppm. Nitrates should be kept as low as possible, ideally below 20 ppm, through regular water changes and live plants.
Lighting
Dim to moderate lighting is best. If you have a brightly lit planted tank, providing shaded areas using floating plants (like Salvinia or Frogbit) will help them feel secure and bring out their brightest colors.
Water flow
They appreciate gentle to moderate water flow, mimicking the slow-moving creeks of their natural habitat.
Decorations and Plants
A dark substrate, such as black sand or dark aquasoil, will make their colors pop. The tank should be heavily planted around the back and sides, leaving open swimming space in the center. Adding driftwood and dried botanicals (like Catappa leaves) will release beneficial tannins, simulating their natural blackwater environment.
Diet
Amapa Glow Tetras are omnivorous micro-predators. In the aquarium, they will readily accept high-quality crushed flakes and micro-pellets. To ensure vibrant coloration and optimal health, supplement their diet with live or frozen foods such as daphnia, baby brine shrimp, and bloodworms.
Some Feeding Tips
Because of their small mouths, ensure all food is appropriately sized. Feed them small amounts 1 to 2 times a day—only what they can completely consume within a couple of minutes to prevent water fouling.
Breeding
Breeding the Amapa Glow Tetra requires a dedicated breeding tank. They are egg-scatterers that exhibit no parental care and will eat their own eggs if given the chance. Set up a dimly lit tank with very soft, acidic water (pH 5.5-6.0) and add fine-leaved plants like Java Moss or artificial spawning mops. Introduce a well-conditioned pair or a small group. Spawning usually occurs in the early morning. Once eggs are spotted, promptly remove the adult fish. The eggs will hatch in about 24-36 hours, and the fry will become free-swimming a few days later, requiring infusoria or specialized liquid fry food until they are large enough for baby brine shrimp.
Conclusion
The Amapa Glow Tetra is an absolute gem for the freshwater aquarium. Their peaceful demeanor, captivating schooling behavior, and the neon-like intensity of their red stripes make them a breathtaking focal point. Whether you are setting up a specialized South American biotope or a lushly planted community tank, these tetras are sure to provide endless viewing pleasure with relatively easy care requirements.
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