Blind Cave Tetra

The (Astyanax mexicanus) is a unique freshwater fish adapted to life in complete darkness. Over generations, this species has lost its eyesight and pigmentation, resulting in a pale pink to white body and highly developed sensory systems.

s are active, hardy, and fascinating to observe. They rely on lateral line sensitivity rather than sight, making them confident swimmers even in low-light aquariums. Their resilience and unusual biology make them a popular choice for aquarists looking for something different. Physical Characteristics

Adult Size: Approximately 7–9 cm (3–3.5 inches)

Coloration: Pale pink to white, semi-translucent

Body Shape: Deep-bodied tetra profile

Eyes: Absent or vestigial

Sexual Dimorphism:

Females are typically rounder, especially when mature

Males are slightly slimmer Behaviour & Temperament

Temperament: Semi-peaceful

Tank Level: Mid to lower levels

Schooling Behaviour: Should be kept in groups of 6 or more

Activity Level: Active, especially during feeding Suitable Tank Mates

Medium-sized tetras

Corydoras catfish

Bristlenose plecos

Peaceful barbs

Other robust community fish

Avoid:

Very small or timid fish

Long-finned species

Aggressive or territorial fish Breeding Information

Spawning Type: Egg scatterer

Breeding Setup:

Slightly cooler water changes to trigger spawning

Fine-leaved plants or spawning mops

Parental Care: None

Notes: Adults may eat eggs; separation required for breeding Special Considerations

May nip fins if kept in small groups

Relies on scent and vibration when feeding

Performs best with regular feeding schedules

Prefers open swimming space rather than heavy planting Aquarium Requirements

Minimum Tank Size: 90–120 litres

Water Temperature: 20–26°C

pH Range: 6.5–8.0

Water Hardness: 5–20 dGH

Substrate: Sand or smooth gravel

Decor: Driftwood, shaded areas

Filtration: Moderate, well-maintained

Lighting: Moderate; plants help diffuse brightness Diet & Feeding

Diet Type: Omnivore

Recommended Foods:

High-quality flakes or micro pellets

Frozen foods such as daphnia and brine shrimp

Occasional live foods for conditioning

Feeding Frequency: Once or twice daily in small portions

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