Mexican Tetra Care Guide
Astyanax mexicanus
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Bioload Score
2400
- Max Size
- 10.0 cm / 4.0"
- Temperature
- 20–25°C (68–77°F)
- pH Range
- 6.0 – 8.0
- Min Tank Size
- 75L (20 gal)
- Min Group Size
- 5 fish
- Tank Level
- Bottom
- Origin
- North America
- Temperament
- Peaceful
- Difficulty
- Easy
- Breeding Difficulty
- Moderate
Diet
Omnivorous; will accept a wide variety of foods including flake foods, pellets, and live or frozen foods such as brine shrimp and bloodworms. Being opportunistic feeders, they are not picky and will readily eat most aquarium diets.
Community Compatibility
Suitable for community tanks with other peaceful fish that thrive in similar water conditions. Their lack of vision means they should not be kept with aggressive species that could take advantage of their blindness. Gentle tank mates are preferred.
Good to Know
Mexican Tetras are a fascinating example of evolutionary adaptation, having lost their eyesight and pigmentation due to living in complete darkness for thousands of generations. They navigate and find food through enhanced non-visual senses, including changes in water pressure and vibrations.
Gender Differences
Minimal; it is difficult to distinguish males from females based on external features alone. Generally, females may be slightly fuller-bodied, especially when gravid.
Stock Mexican Tetra in Your Tank
Use our free stocking calculator to see if Mexican Tetra fits your aquarium