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Eigenmannia vicentespelaea, a rare cave-dwelling glass knifefish, adds a unique touch to aquariums with its ghostly appearance and gentle, nocturnal nature.

Detailed Product Description

Overview

Eigenmannia vicentespelaea is a fascinating species of weakly electric knifefish found in Brazilian cave systems. Unlike other knifefish, it thrives in dark environments with minimal light, making it a rare and unique choice for dedicated aquarists. Known for its elongated, translucent body and undulating swimming motion, this species brings a mesmerizing presence to well-maintained aquariums.

Key Features:

• Scientific Name: Eigenmannia vicentespelaea

• Common Name: Cave Glass Knifefish

• Origin: Brazil (Cave habitats)

• Adult Size: 15–20 cm (6–8 inches)

• Temperament: Peaceful, best kept with similar-sized tankmates

• Activity Level: Nocturnal, prefers dimly lit tanks

• Lifespan: 5–10 years with proper care

Tank Requirements & Water Conditions

Since Eigenmannia vicentespelaea is native to dark, slow-moving cave waters, replicating its natural habitat in an aquarium is essential for its well-being.

• Tank Size: Minimum 40 gallons for a single fish; larger tanks recommended for groups

• Water Temperature: 24–28°C (75–82°F)

• pH Level: 6.0–7.5

• Water Hardness: Soft to moderately hard (2–10 dGH)

• Filtration: Strong biological filtration is required; sponge filters or canister filters work well

• Substrate & Décor: Fine sand or smooth gravel, with caves, driftwood, and hiding spots

• Lighting: Dim lighting or blackwater setup preferred to mimic cave conditions

• Tank Mates: Peaceful fish such as tetras, rasboras, or other non-aggressive species

Since these knifefish rely on weak electrical signals for navigation and communication, avoid housing them with other electric fish (e.g., elephant nose fish) to prevent interference.

Feeding Habits & Diet

Eigenmannia vicentespelaea is a carnivorous species with a preference for protein-rich foods. Since they are nocturnal feeders, offering food during the evening or with subdued lighting is ideal.

• Preferred Diet:

  • Live and frozen foods such as bloodworms, brine shrimp, daphnia, and tubifex worms

  • High-quality sinking carnivore pellets

  • Occasionally, finely chopped fresh seafood like shrimp or fish

• Feeding Schedule:

  • Feed once or twice daily in small portions

  • Ensure food reaches them before faster surface feeders consume it

These fish are sensitive to water quality, so avoid overfeeding, as decaying food can quickly deteriorate tank conditions.

Care & Maintenance

Eigenmannia vicentespelaea requires a dedicated aquarist who can maintain stable water conditions and a stress-free environment.

• Water Changes:

  • 20–30% weekly water changes to maintain water quality

  • Use dechlorinated, conditioned water matching tank parameters

• Health Considerations:

  • Prone to stress-related diseases if water parameters fluctuate

  • Monitor for signs of fungal or bacterial infections

  • Avoid medications containing copper, as knifefish are sensitive to it

• Behavior & Social Interaction:

  • Shy and reclusive, often hiding during the day

  • Prefers to be kept in small groups (3–5 individuals) for social comfort

  • Emits weak electrical signals to communicate, detect food, and navigate

Why Choose Eigenmannia Vicentespelaea for Your Aquarium?

• Rare and unique addition to specialty aquariums

• Peaceful and compatible with a wide range of tankmates

• Fascinating nocturnal behaviors and weak electric navigation

• Suitable for experienced aquarists looking for a rewarding challenge

By providing the right environment, diet, and care, you can enjoy the captivating presence of the Eigenmannia vicentespelaea in your home aquarium for years to come.