Overview
The Blind Cave Tetra (Astyanax mexicanus) is a beginner freshwater species known for its pink-white (albino-like) coloration. Eyeless cave-dwelling form. All levels.
Origin & Appearance
Origin: Mexico.
Colors: Pink-White (albino-like).
Body Shape: Fusiform (torpedo/streamlined). Typical adult dimensions: 12.0 x 2.2 x 3.6.
Sexual Dimorphism: Minimal; no visual differences.
Tank & Water Requirements
| Min Tank Size | 20 gallons |
| Temperature | 68–77°F |
| pH Range | 6.5–8 |
| Water Hardness (GH) | 8-20 |
| Bioload | medium |
| Oxygen Demand | low |
| Plant Safe | yes |
| Aquarium Position | All levels |
Behavior & Activity
Constant mid-to-bottom exploring; uses lateral line to navigate; bumps along surfaces sensing vibrations; never stops moving
Speed: 35/100Aggression: 3/10diurnalSchooling (6+)
Breeding
Moderate; egg scatterer
Common Diseases
💊 Very hardy💊 few diseases
Expert Notes
Eyeless cave-dwelling form