{"product_id":"black-ghost-knife-22-27cm","title":"Black Ghost Knife 22\/27cm","description":"\u003cp\u003e\u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e (Apteronotus albifrons) is a larger, impressive specimen of the classic Black Ghost Knife Fish, already around 22–27cm and ready for a spacious display aquarium. With its smooth, blade‑like body, ghostly black colour and graceful swimming style, this \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e is best suited to experienced aquarists with a large, well‑filtered tank and suitable tank mates.\u003c\/p\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eThe \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e is a stunning, larger‑sized Black Ghost Knife Fish that makes an immediate impact in a big freshwater aquarium. With its jet‑black body, white markings on the tail and unique, undulating swimming motion, the \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e looks like it’s gliding through the water rather than swimming.\u003c\/div\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eThis species, \u003cstrong\u003eApteronotus albifrons\u003c\/strong\u003e, comes from South America where it inhabits dimly lit rivers and streams. It’s a nocturnal, weakly electric fish that uses electric signals to navigate and locate food. Because of its size and sensitivity, the \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e is best kept by intermediate to advanced aquarists who can provide a suitably large, stable aquarium.\u003c\/div\u003e\n\u003ch3\u003eSize and Lifespan\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCurrent size: \u003cstrong\u003eapproximately 22–27cm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePotential adult size: can reach \u003cstrong\u003earound 40–50cm\u003c\/strong\u003e in a suitably large aquarium\u003c\/li\u003e\n\u003cli\u003eLifespan: with good care, \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e can live for many years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eWhen you purchase a \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e, you’re getting a substantial fish that still has room to grow. Planning for its adult size and long‑term care is essential.\u003c\/div\u003e\n\u003ch3\u003eBlack Ghost Knife 22\/27cm – Tank Requirements\u003c\/h3\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eBecause of their size and active swimming style, \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e need a spacious aquarium:\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eRecommended tank size: a \u003cstrong\u003elarge aquarium\u003c\/strong\u003e (4ft+ in length, bigger is better) for a single \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e, with more space as it approaches full size\u003c\/li\u003e\n\u003cli\u003eFiltration: strong, reliable filtration with good biological capacity and gentle flow in resting areas\u003c\/li\u003e\n\u003cli\u003eDécor: plenty of \u003cstrong\u003ehiding places\u003c\/strong\u003e – caves, pipes, driftwood and plants help the fish feel secure\u003c\/li\u003e\n\u003cli\u003eLighting: relatively \u003cstrong\u003edim or shaded areas\u003c\/strong\u003e, as the \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e is naturally more active at night\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eSoft sand or smooth gravel is preferred so the fish doesn’t injure its delicate skin when exploring the bottom and squeezing into hides.\u003c\/div\u003e\n\u003ch3\u003eWater Parameters (Guide Only)\u003c\/h3\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eThe \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e can adapt to a range of conditions if changes are slow and water quality is high:\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eTemperature: around \u003cstrong\u003e24–27°C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003epH: roughly \u003cstrong\u003e6.5–7.5\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHardness: soft to moderately hard water\u003c\/li\u003e\n\u003cli\u003eAmmonia \u0026amp; Nitrite: \u003cstrong\u003e0 ppm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eNitrate: kept low with regular water changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eStable, clean water is more important than chasing exact numbers. Avoid sudden swings in temperature, pH or hardness.\u003c\/div\u003e\n\u003ch3\u003eFeeding Black Ghost Knife Fish\u003c\/h3\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eThe \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e is a carnivorous, nocturnal feeder that prefers meaty foods:\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable foods:\n\u003cul\u003e\n\u003cli\u003eFrozen or live bloodworms\u003c\/li\u003e\n\u003cli\u003eBrine shrimp\u003c\/li\u003e\n\u003cli\u003eBlackworms\u003c\/li\u003e\n\u003cli\u003eSmall prawns or shrimp pieces\u003c\/li\u003e\n\u003cli\u003eQuality sinking carnivore pellets or sticks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eFeed your \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e in the evening or when lights are dimmed, as they are more confident and active at night. Offer modest portions and remove uneaten food to maintain water quality.\u003c\/div\u003e\n\u003ch3\u003eBehaviour and Temperament\u003c\/h3\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003e\n\u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e are generally peaceful towards other species, but can be territorial with their own kind in smaller tanks:\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003ePersonality: shy to semi‑bold, often hiding during the day and exploring more at night\u003c\/li\u003e\n\u003cli\u003eTemperament: usually peaceful, but may become stressed or aggressive if crowded or kept with fin‑nippers\u003c\/li\u003e\n\u003cli\u003eActivity: glides along the bottom and mid‑levels, weaving in and out of décor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eProviding enough hides and visual barriers helps your \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e feel secure and show more natural behaviour.\u003c\/div\u003e\n\u003ch3\u003eTank Mates for Black Ghost Knife 22\/27cm\u003c\/h3\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eChoose tank mates that are:\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eLarge enough not to be seen as food by a growing \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeaceful to semi‑aggressive, but not persistent fin‑nippers\u003c\/li\u003e\n\u003cli\u003eComfortable in similar water parameters and temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"mb-1 mt-2 whitespace-pre-line leading-relaxed first:mt-0\" data-sentry-component=\"P\" data-sentry-source-file=\"p.tsx\"\u003eAvoid very small fish, aggressive fin‑nippers and other electric knife fish species in the same tank. Always consider the adult size of your \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e when planning long‑term stocking.\u003c\/div\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for small aquariums\u003c\/strong\u003e – this \u003cstrong\u003eBlack Ghost Knife 22\/27cm\u003c\/strong\u003e will need a large tank as it grows.\u003c\/li\u003e\n\u003cli\u003eSensitive to poor water quality – strong filtration and regular maintenance are essential.\u003c\/li\u003e\n\u003cli\u003eProvide plenty of hiding spots so your \u003cstrong\u003eBlack Ghost Knife Fish\u003c\/strong\u003e feels secure and settles in well.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Aquarium Haven \u0026 Brisbane Discus","offers":[{"title":"Default Title","offer_id":43689872982104,"sku":"MIS-BGKXL22\/27","price":110.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0704\/0152\/3800\/files\/Black-Ghostknife_72768760-9ab7-41a8-b6b8-bc62b2824854.webp?v=1778718752","url":"https:\/\/aquariumhaven.com.au\/products\/black-ghost-knife-22-27cm","provider":"Aquarium Haven \u0026 Brisbane Discus","version":"1.0","type":"link"}