Black Ghost Questions??

Can u plz tell me something abt the Black Ghost Knife Fish!
moreover, cld u plz answer the followng Q’s:
1) How do i differentiate between a male & a female..?
2)Wat is their behaviour like,wen their ill??
3)I dont have plants in my tank, cld this affect them in any way?
4)My oxygen pipe makes a bubbling noise & they always stick around there, wat cld be the reason for that???
&5)I dont have any other fish in the tank, its just the 2 of them, cld they pose to be a threat to each other, as in the case of a Betta Fighter Fish???

Here are some info that will help you:

Scientific name: Apteronotus albifrons
Common name: Black Ghost Knife
Genus: Apteronotus
Order: Cypriniformes
Family: Apteronotidae
Size: up to and around 20″ (49cm)
Origin: Northern, South America in the Amazon River Basin
Minimum Tank Size: 48″
Tank setup: Floating plants to diffuse the light along with places to hide are recommended
Compatibility: Suitable for a large community tank with larger community fish.
Water Type: Freshwater
Temperature: 73ºF to 82ºF (23-28°C)
Hardness: dH range: 5.0 – 10.0
pH: 6.0 – 8.0
Breeding: Little is known at this time
Feeding: Live fish, blood worms, brine shrimp, etc..

The Black ghost knife is one of those most popular knife fish hobbyists keep. It has an elongated, compressed body which is usually black with a few white stripes. It should be kept with a small stoned substrate and lots of plants and places to hide. A very good fish to keep that has a great personality and should not be kept with fish that it can swallow. They can get a bit aggressive, but kept in the right environment, they can be a great fish to keep!

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