Overview
The Blind Cave Tetra is a fascinating species that has adapted to life without light in underground caves. It's known for its translucent body and red eyes, which help it navigate in the dark. These fish are generally peaceful and can be kept in a community tank with other peaceful species. They are moderate swimmers and require a tank of at least 30 liters. Blind Cave Tetras are a great choice for beginners due to their hardiness and easy care requirements.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Characidae |
| Genus | Astyanax |
| Species | Astyanax mexicanus |
| Water type | freshwater |
Natural Habitat
These tetras are native to the limestone caves in Mexico, where they live in total darkness.
Appearance
These tetras have a slender, elongated body with a unique translucent appearance, revealing their internal organs and blood vessels. Their eyes are bright red and adapted to detect movement in the dark.
Behavior
Blind Cave Tetras are generally calm and non-aggressive. They do not form schools and should be kept in a tank with other species that are not overly aggressive. They enjoy exploring the tank and should have plenty of space to swim.
| Trait | Value |
|---|---|
| Temperament | Peaceful |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 21–27°C (70–81°F) | Use a reliable adjustable heater |
| pH | 6–7.5 | Avoid sudden swings |
| Hardness (GH) | 5-15 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 30L (8 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- They have no pigmentation and rely on their red eyes to navigate and detect prey.
- These tetras are also known as the Mexican Tetra or Texas Blind Cavefish.
- They are considered a delicacy in some parts of Mexico.
📋 Full Care Guide
Ready to set up a tank for your Blind Cave Tetra? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Blind Cave Tetra Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.