Animal Stories - Knifefish


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Mark - 2010-11-12
Can an African brown knifefish coexist with a black ghost knifefish?

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  • samiran roy,india - 2011-09-02
    Yes, they can can, but only if you have a large enough tank and plenty of hiding places for the two and also at the same time, be ready for squabbles because the black gf can be fiesty.
  • E.J. - 2011-09-08
    Most definitely they can. I have Ghost Knifes, African Knifes, Clown Knifes, and another brown type of Knife with a yellow streak down its back, that I am unsure of the name, all living in the same 55 gallon tank. They seem to all get along well except for the Clowns, now that they are getting larger they have become more aggressive so I will be putting them into their own tank soon.
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Animal-World info on Black Ghost Knife Fish
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david - 2011-06-12
Can I keep an Apteronotus albifrons in a 55 gallon aquarium with 2x Geophagus steindachneri and 3x Metynnis argenteus?

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  • Charlie Roche - 2011-06-13
    Nope-sorry. The Knifefish needs a minimum of 100 gallon tank on his own. They can be agressive and they do get huge and if it fits in their mouth, they will attempt to eat it.
  • samiran roy,india - 2011-09-02
    If the BGK is about 2 inches, it can be kept, but you should have a future planning for the fish because they get to be 40 cm or more.
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Andrew Prosser - 2011-07-26
I had two black ghost knife fish. For some reason they both died . I don't know why. If anybody has a clue why they died, Please let me know.
I bought another one last he doing pretty good.
What that kind of fish usually eat? The night I bought some guppies for them to eat.

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  • Charlie Roche - 2011-07-27
    Any symptoms - strange behaviors - anything? How long had you had them? Check out Fish Diseases and Treatment - link should be here and see if your ghost displayed anything at all unusual as described in the symptoms. Also, check to make sure your tank and living conditions are appropriate for that size fish. They need lots of room. Animal World recommends at least a 100 gallon tank.
  • samiran roy,india - 2011-09-02
    They relish on neon tetras.
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jeff wilson - 2011-04-05
Is $8.94 to cheap for black ghost knife fish, and is the ph a big deal for them?

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  • JC - 2011-08-16
    Yes it's a good deal half the normal price.
  • samiran roy,india - 2011-09-02
    i got mine which is about 2 inches for 100rs, which is about 2 dollars.
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Tori - 2011-08-29
My ghost knife is out all the time cruising round for food,it eats everything I put in tank. I have a community tank and feed bloodworms,pellets,flakes,turtle food. He loves to swim upside down on surface of water hoovering up food,and eats from my hand every night along with the Siamese fighter. He is a very cool fish and am surprised how active he is!!

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  • Anonymous - 2011-08-29
    Neat
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Animal-World info on African Knife Fish
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Josh - 2011-03-25
What is the smallest fish that can be kept with african knife fish without getting eaten? Will they eat normal flakes?

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  • david - 2011-06-15
    Experiment with foods and tankmates until you know.
  • kg - 2011-06-17
    You should be fine with most fish. At first they are very timid, but they eventually become more active as said in the article. Mine lives happily in a peaceful 150 gallon aquarium. He is alongside guppies, mollies, upsidown cats, tetras, platys, black ghost knife, gauramis, rasboras, plecos, suckers, boatias, and a betta. My advice would be that they can be kept with anything as long as the take has ample room and he is fed well. They will eat flakes, but they sure do love bloodworms. - kg
  • Vitaly V Kravets - 2011-07-18
    Nothing that would be small enough to fit in its mouth like neons or guppys. I would recomend to have it on a blood worm diet or even earth worms that are smaller that you can cut up into chunks work,they like meat! Good luck
  • Dylan - 2011-08-26
    My knife fish lives peacefully with guppies mollies platties a gold dojo loach gouramis and a few others in a 50 gallon tank. They are territorial but as long as you keep him well fed he won't bother little guys. Also mine loves earth and blood worms however you can train it to eat flakes or pellets by putting a little garlic juice on them, they love garlic, garlic is generally a flavoring in fish foods. They like meaty foods because they are predators so I would stick with some sort of edible worm
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Animal-World info on Black Ghost Knife Fish
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Marianne Tacliad - 2011-07-20
i just bought my black ghost knife about 3 weeks ago and I put him with my 7 wagtail platys, 5 zebra danios, 5 cory cats, 2 albino red-tailed shark, 1 betta and 5 black mollies including 2 of its fries. I read in some comments that they eat other fishes especially smaller ones, but mine doesn't. He's very gentle to his tankmates and he eats feed granules (with spirulina algae and shrimp enzyme) more than bloodworms (funny, considering they're carnivorous) especially if the granules sink to the bottom like rain. He comes out of his house (he usually stays inside the nipa hut-like ceramic decor) and catch the falling feeds with his mouth. The only thing he murders is the cabomba plant. My mom saw him twice with the plant in his mouth running around the tank like a torch bearer. She says it's hilarous. I wish I caught it on cam so I can upload it.

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  • Charlie Roche - 2011-07-20
    I sincerely hope you have one absolutely totally enormous tank because that is a whole lot of fish and just based on 1 inch per adult size needing a gallon. You say the Black Ghost Knife doesn't eat the other fish. The sentence is a little off. The Black Ghost Knifefish HASN'T eaten any other fish "YET" It will. The Black Ghost is going to go about 20 inches and anything he can get his mouth around, he is going to eat. You might want to re-think your tank and community and separationa and size of tank for the others. So good news is the Black Knife HASN'T eaten any of the other fish "YET"
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Zardo - 2011-05-23
Hey I have a black ghost knife fish, his tail is different to the one shown but I think it's nothing. How do I get him to not hide behind my Fluval 2 filter? Is it ok to feed him dead crickets? Please respond. Thanx

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  • Charlie Roche - 2011-05-24
    Yep it is OK. The documents say wingless crickets and you purchase them.
  • taxman - 2011-07-11
    I have ghost fish in a "L" shape tank. 1 is "odd" shaped due to being injured several times as a youngin. 2 larger ones now about 11 and 12 inch respectively - "Hunchback" only about 6 inches (if I could straighten out) - so your "different tail" could be due to injury or variation to breed. Put more places for GK to hide and will be more likely to leave filter alone - glass pipes work well - can see them, but they think they're hidden - also too much light will send them looking for cover. Re crickets - I have fed mine crickets that have gotten into house, flies, even the occasional moth. I've been keeping GK's for over 15 years and only lost 1 (approx 15 inches) after moving house and using a temporary filter - that died while I was at work. They've all started from less than 2 inches; when purchased.
    Hope that gives you some assistance and reassurance.
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Animal-World info on Clown Knifefish
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scollinz - 2011-06-27
I have a 13 inch Clown Knife fish I am looking
to sell. If interested, email me and I can send you pics. Great fish and loves to eat!

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Animal-World info on African Knife Fish
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david - 2011-06-12
I have an African Brown Knifefish in a 20 gallon tank with a Leopard Ctenopoma and two African Butterflyfish. The tank is planted with three Amazon Sword Plants, four Egyptian Lilies and about 7 Java Ferns. All the fish in the tank are 3.5 inches long. I know this setup is too small in the long term but I am saving up for a larger 55 gallon.

All the fish in the tank get along relatively fine. The Butterflyfish will occasionally chase each other around but the Leopard Ctenopoma and Knifefish never get involved in the top-level disputes. The Ctenopoma and Knifefish do occasionally squabble but never leave any marks on each other. It is basically just a chase around the tank and after about one lap they go their separate ways. I am not overly concerned about this as MINOR squabbles should always be expected in community tanks.

Anyway. the African Brown Knifefish is a very delightful occupant of my tank. Feed him a mixed diet of bloodworms, brine shrimp, beef heart, rosy red minnows, ghost shrimp, apple snails and the occasional earthworm. I almost never see him during the day except when I am cleaning the tank. But when the lights are off he comes out for all to see! I strongly recommend this fish.

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  • Charlie Roche - 2011-06-13
    These guys are going to get a lot bigger and the squablles are going to be fights and someone is going to get hurt. I would think the Knifefish would think the butterfly fish is food as he is going to go about a foot long. I mean that's how you catch bass.
  • Charlie Roche - 2011-06-15
    Whoops sorry, I know it is the mouth size but got the fish bass awkwards there. Thank you for explaining though cuz I will try and keep it straight. I like the butterfly fish. Enjoy
  • david - 2011-06-15
    I am going to bring the Leopard Ctenopoma back to my lfs, as the squabbles turned into biting yesterday.
  • david - 2011-06-15
    Actually, it is the Leopard Ctenopoma that thinks that the African Butterflyfish are food. Even when the knifefish is larger, he couldn't get the butterflyfish into his mouth. The size of the fish another fish can eat is dictated by mouth size, not by body size. A 12 inch knifefish would have a mouth around 1 1/2 inches, 2 inches would be pushing it. The African Butterflyfish are already 3.5 inches. Unless my Knifefish is a freak of nature and turns into a 12 inch fish with a 5 inch mouth, the Butterflyfish are safe.
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