Family	Habitat	Water Temperature	pH	Hardness	Size in Aquarium	Recommended Tank Size per Adult	Lifespan
Anostomidae	South America – Orinoco and Amazon river basins	72–81°F (22–27°C)	6.0–7.5	4–19 dGH	Up to 5.5 in (14 cm)	Minimum 26 gallons (100 liters)	10–15 years

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Key Takeaways

• Marbled Abramites are active schooling fish with a unique tilted swimming style.
• They are peaceful when young but can become territorial as adults.
• Best kept in species-only tanks with rocks, driftwood, and hardy plants.
• Primarily herbivores – require a plant-based diet.
• Reproduction in captivity is difficult and often requires hormone stimulation.

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Appearance

The Marbled Abramites (Abramites hypselonotus) has an elongated, torpedo-shaped body with a light brown base color and dark vertical stripes. The adipose fin and the top of the head often show a yellowish tint. Males are slimmer, while females are fuller-bodied and slightly duller in coloration. In the wild, they grow to about 14 cm (5.5 in), while in aquariums they tend to stay a bit smaller.

Behavior and Temperament

These fish prefer to swim in groups and occupy the middle and bottom layers of the tank. They have a distinctive way of swimming – at about a 45° angle to the horizontal line. Juveniles are calm and peaceful, making them suitable for community aquariums with other non-aggressive fish. However, adults often develop territorial behavior, showing signs of aggression toward tank mates. Their strong jaws allow them to defend themselves and even bully other fish.

Aquarium Setup

A tank of at least 26 gallons (100 liters) and 32 in (80 cm) in length is recommended for one adult fish. The bottom should include hiding spots such as rocks, caves, and driftwood. Because they nibble on plants, only hardy species with stiff leaves should be used. Alternatively, artificial plants can be placed closely together to create dense cover. They are shy and excellent jumpers, so always keep the tank covered. Lighting should be soft and diffused.

Water Quality

Maintaining high water quality is critical. These fish are sensitive to nitrogen compounds such as ammonia, nitrite, nitrate, and excess phosphates. Strong filtration, proper aeration, and regular water changes are essential. Every aquarist should have basic water test kits on hand to monitor nitrate and phosphate levels. Conditioners that neutralize chlorine and heavy metals from tap water are highly recommended when performing water changes.

Feeding

Marbled Abramites are primarily herbivores. Their diet should focus on plant-based foods such as blanched peas, lettuce leaves, and sprouted vegetables or grains. If they don’t receive enough plant matter, they may destroy live plants in the aquarium. For best health, feed them a varied diet that includes high-quality vegetable-based flakes, pellets, and occasional fresh greens.

Breeding

Marbled Abramites reach sexual maturity at around 2 years of age. Breeding them in home aquariums is extremely challenging. Successful reproduction usually requires hormone injections, making it impractical for most hobbyists.

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FAQ

• Are Marbled Abramites good for community tanks?
  Young fish are peaceful, but adults can become aggressive. They do best in species-only setups.
• Do they eat plants?
  Yes. They are herbivores and will eat most soft-leaved plants unless provided with enough vegetables in their diet.
• How many should be kept together?
  They are schooling fish, so it’s better to keep a small group rather than a single specimen, provided the tank is large enough.
• Are they suitable for beginners?
  They require good water quality, strong filtration, and careful feeding, so they are better suited for intermediate aquarists.

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Author: AquaFaq

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