All Fresh Water Fish

Black ghost knifefish

New Fish Tank Tips: Get an aquarium filter that has multiple (2) media cartridges. This will allow you to change out one at a time. If you swap out all of the filter media with new media you run the risk of having to go through a mini aquarium cycle. Good power filters that hang on the back of the tank usually come with a separate floss system that you never have to change.
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The black ghost knifefish, Apteronotus albifrons, is a tropical fish belonging to the ghost knifefish family (Apteronotidae). They originate in South America in the Amazon Basin in Peru and from Venezuela through Paraguay in the Paraná Rivers. They are becoming popular in aquaria. The fish is all black except for two white rings on its tail, and a white blaze on its nose, which can occasionally extend into a stripe down its back. It moves mainly by undulating a long fin on its underside. It will grow to a maximum length of 25 inches (60 centimeters).

The black ghost knifefish natively lives in fast moving, sandy bottom creeks in a tropical climate. They prefer water with a 6.0 – 8.0 pH, a water hardness of 5.0 – 19.0 dGH, and a temperature range of 73-82 F (23-28 C). South American natives believe that the ghosts of the departed take up residence in these fish [2], hence the name.

These fish require a minimum tank size of 75 US gallons (280 litres) due to their large size. They should not be kept with neon tetras and other very small fish because the black ghost knifefish will eat the small fish. Black ghost knife fish prefer highly oxygenated air pockets and will spend many an hour reversing into “bubble walls” made by air filter stones[citation needed] . In the aquarium black ghost knifefish will eat carnivore pellets, bloodworms and feeder fish. They will also eat peas, earthworms and frozen community fish foods.

Due to their weak electric discharge, a close, contained group of knife fish (as in an aquarium) will line up side by side[citation needed].