The Congo Tetra is a striking species of freshwater fish that is popular for its colorful appearance and peaceful temperament. Native to Central Africa, these fish are commonly kept in aquariums due to their shimmering, iridescent scales and elegant swimming style. Congo Tetras are considered hardy and adaptable, making them a great choice for aquarists looking for a beautiful and relatively low-maintenance fish.
Scientific Name:
Phenacogrammus interruptus (Congo Tetra)
Maximum Size:
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Congo Tetras can grow up to 3-4 inches (7-10 cm) in length.
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Males tend to be slightly smaller than females and are typically more brightly colored, especially during breeding season.
Native Region:
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Congo Tetras are native to the Congo River Basin in Central Africa.
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They are commonly found in slow-moving rivers, streams, and swamps with dense vegetation and neutral pH water.
Diet (Carnivorous or Omnivorous?)
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Omnivorous, meaning they will consume both plant-based and animal-based foods.
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In the wild, they feed on a variety of small invertebrates, small crustaceans, and plant matter.
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In captivity, they thrive on:
✅ High-quality flake food or pellets.
✅ Live or frozen foods such as brine shrimp, daphnia, and bloodworms.
✅ Vegetables, including blanched spinach, zucchini, and peas.
✅ Algae-based foods to help mimic their natural diet.
❌ Avoid overfeeding, as it can lead to water quality issues and obesity.
Lifespan:
Breeding Season & Behavior:
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Breeding Congo Tetras in captivity can be challenging, but with the right conditions, it is possible to induce spawning.
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They are egg layers, and the male fertilizes the eggs externally after the female lays them.
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Spawning typically occurs during the rainy season, so mimicking these conditions (higher water temperature and gentle water flow) can encourage breeding.
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The eggs are laid among plants or spawning mops, and once fertilized, they hatch within 24-48 hours.
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Temperature plays a key role in breeding, with a range of 75-80°F (24-27°C) being ideal for inducing spawning.
Best Tank Mates:
Congo Tetras are peaceful, social fish that do well in community tanks with other non-aggressive species. They enjoy being kept in groups of at least 6 or more, as they are a schooling species.
✅ Other peaceful species (Neon Tetras, Guppies, Corydoras, Rasboras, Platies)
✅ Small to medium-sized peaceful cichlids (Apistogramma, Rams, Kribs)
✅ Snails (Nerite Snails, Mystery Snails)
✅ Small shrimp (Cherry Shrimp, Amano Shrimp)
✅ Other tetras (Ember Tetras, Black Phantom Tetras, Rummynose Tetras)
🚫 Avoid:
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Aggressive species (e.g., larger cichlids or predatory fish), as these can stress or harm the Congo Tetra.
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Fin-nipping species, as Congo Tetras have delicate fins and can be stressed by such behavior.
Ideal Tank Conditions:
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Tank Size: A 20-gallon tank is the minimum for a small group of Congo Tetras, but larger tanks are preferred for maintaining a peaceful and healthy environment.
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Temperature: 75-80°F (24-27°C), as Congo Tetras are tropical fish that prefer warm water.
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pH: 6.0-7.5 (slightly acidic to neutral), which mimics their natural environment.
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Water Hardness: Soft to moderately hard water is ideal for Congo Tetras.
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Filtration: A gentle filtration system is best, as Congo Tetras prefer calm waters with minimal current.
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Décor:
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Planted tanks are ideal, as Congo Tetras enjoy swimming in plants and using them for shelter.
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Fine gravel or sand works well as the substrate.
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Driftwood, rocks, and hiding spots will create a natural environment and provide the fish with places to hide if they feel threatened.
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Floating plants can help simulate the dimmer, shaded environment Congo Tetras naturally inhabit.
⚠ Important Notes:
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Congo Tetras are schooling fish that do best in groups of at least 6 individuals, so it's important to provide enough space for the entire group.
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They are generally peaceful and get along well with other community fish, but like many schooling species, they may be stressed if kept alone or in too small of a group.
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Regular water changes are crucial to maintaining high water quality, as Congo Tetras are sensitive to poor water conditions.
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Their breeding season is linked to water conditions, such as temperature and water flow, so creating a conducive environment is key for successful breeding.
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Congo Tetras are known for their shimmering, iridescent colors, which are most vibrant when kept in properly maintained aquariums with stable water conditions.
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