The Black Widow Tetra (Gymnocorymbus ternetzi) is a popular freshwater fish species among aquarium enthusiasts. Here are some key characteristics and information about the Black Widow Tetra Size and Lifespan These tetras grow to about 6 cm, offering a compact yet striking presence. Additionally, they live around 3–5 years with proper care. Thus, maintaining stable water conditions and a balanced diet boosts their longevity. As a result, they remain a lively addition to your aquarium for years. Ideal Tank Setup Black Widow Tetras need a 60-litre tank with ample swimming space. Furthermore, plants and driftwood create a natural vibe. Also, keep water between 22°C–26°C and pH 6.0–7.5. Regular water changes and gentle filtration ensure health. To replicate its natural habitat: Add live plants like Java fern or Anubias. Incorporate driftwood or rocks for hiding spots. Use a soft substrate like sand or fine gravel. Compatible Tank Mates These peaceful fish thrive with non-aggressive species. Moreover, keeping them in groups of six or more reduces stress. However, avoid long-finned fish due to occasional fin-nipping. Suitable tank mates include: Neon Tetras Corydoras Catfish Rasboras Diet and Feeding Feed these omnivores high-quality flakes or micro-pellets daily. Additionally, offer live or frozen foods like brine shrimp or bloodworms. Also, include blanched veggies like spinach for variety. Consequently, a varied diet enhances their colours and health. Therefore, feed small portions twice daily to avoid overfeeding. Breeding and Behaviour of Black Widow Tetra Breeding is simple with a separate tank and soft, acidic water. Furthermore, use fine-leaved plants for egg-laying. After spawning, remove adults to protect eggs. Fry hatch in 24–36 hours. Moreover, their schooling behaviour adds liveliness, but stress arises if kept alone. Thus, group housing promotes natural activity. Key Faqs Species – Gymnocorymbus ternetzi Common Name – Black Widow Tetra Origin – South America Diet – Omnivore PH Range – 6.0–7.5 Temperature – 22°C–26°C Breed Type – Egg-layer Current Size – Approximately 3–4 cm Max Size – Up to 6 cm Tank Size – Minimum 60 liters
