{"product_id":"long-fin-black-widow-tetra-gymnocorymbus-ternetzi","title":"Long Fin Black Widow Tetra | Gymnocorymbus ternetzi","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eThe Black Widow (or Black Skirt) Tetra fades from inky black to smoky silver as it ages — bold, hardy and full of personality. This is the flowing long-fin form, differing from the standard fish only in its extended, trailing finnage. A classic, easygoing shoaler for a community tank.\u003c\/p\u003e\u003ch2\u003eNatural Habitat\u003c\/h2\u003e\u003cp\u003e\u003cem\u003eGymnocorymbus ternetzi\u003c\/em\u003e comes from the Paraguay and Guaporé river basins of central South America, where it shoals among vegetation and submerged wood in slow, soft, slightly acidic to neutral water.\u003c\/p\u003e\u003ch2\u003eAppearance\u003c\/h2\u003e\u003cp\u003eA deep, laterally compressed body with two dark vertical bars behind the head and dusky black rear fins that fade to grey with age. The long-fin form carries elongated, veil-like dorsal and anal fins. Selectively bred colour morphs also exist.\u003c\/p\u003e\u003ch2\u003eTemperament and Compatibility\u003c\/h2\u003e\u003cp\u003eGenerally peaceful, but it has a reputation as an occasional fin-nipper — best curbed by keeping a proper shoal of six or more (ideally more). In a good group it is confident and settled. Keep it away from very long-finned, slow tankmates that invite nipping.\u003c\/p\u003e\u003ch2\u003eFeeding\u003c\/h2\u003e\u003cp\u003eAn easy-going omnivore. Feed quality flakes and micro-pellets as a base, with frozen or live bloodworm, daphnia and brine shrimp for variety and colour. It takes food readily at all levels.\u003c\/p\u003e\u003ch2\u003eCare Requirements\u003c\/h2\u003e\u003cp\u003eUndemanding and hardy — ideal for a maturing community tank. Soft to neutral water, gentle to moderate flow, and some planting and open swimming space suit it well. Stable water and routine maintenance are all it needs.\u003c\/p\u003e\u003ch2\u003eBreeding\u003c\/h2\u003e\u003cp\u003eAn egg-scattering species. A conditioned group scatters eggs among fine-leaved plants; the adults will eat the eggs, so separate them afterwards. Fry hatch in a day or two and take infusoria then baby brine shrimp.\u003c\/p\u003e\u003ch2\u003eSpecies Information\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eScientific Name\u003c\/td\u003e\n\u003ctd\u003eGymnocorymbus ternetzi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Name\u003c\/td\u003e\n\u003ctd\u003eLong Fin Black Widow Tetra\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eParaguay \u0026amp; Guaporé basins, South America\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Size\u003c\/td\u003e\n\u003ctd\u003eAround 5–6 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLifespan\u003c\/td\u003e\n\u003ctd\u003e3–6 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003ePeaceful; can nip fins if kept in small numbers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifficulty\u003c\/td\u003e\n\u003ctd\u003eBeginner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tank Size\u003c\/td\u003e\n\u003ctd\u003e60 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tank Size\u003c\/td\u003e\n\u003ctd\u003e75 litres or more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiet\u003c\/td\u003e\n\u003ctd\u003eOmnivore (micro foods)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature\u003c\/td\u003e\n\u003ctd\u003e22–26 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e6.0–7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGH Range\u003c\/td\u003e\n\u003ctd\u003e3–15 dGH (soft to moderately hard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003eNot applicable (freshwater)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable For\u003c\/td\u003e\n\u003ctd\u003eBeginners; community tanks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Safe\u003c\/td\u003e\n\u003ctd\u003eNot applicable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlant Safe\u003c\/td\u003e\n\u003ctd\u003eYes — plant safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eSuitable Tank Mates\u003c\/h2\u003e\u003cp\u003eOther robust community fish of similar size: larger tetras, barbs, danios, rainbowfish, Corydoras and peaceful catfish. Best in a shoal within a lively community.\u003c\/p\u003e\u003ch2\u003eAvoid Keeping With\u003c\/h2\u003e\u003cp\u003eLong-finned, slow fish (angelfish, guppies, male bettas) that may be nipped, and large aggressive cichlids. Keeping too few together increases fin-nipping.\u003c\/p\u003e","brand":"Nick's Aquarium Oceanarium Terrarium","offers":[{"title":"Small (1-5cm)","offer_id":55232816054563,"sku":"AA2039","price":8.95,"currency_code":"AUD","in_stock":true},{"title":"Medium (5-10cm)","offer_id":55232816087331,"sku":null,"price":13.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Long_fin_Black_Widow_Tetra.jpg?v=1781484074","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/long-fin-black-widow-tetra-gymnocorymbus-ternetzi","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}