Animal Stories - Clown Knifefish

Animal-World Information about: Clown Knifefish

The beautiful Clown Knifefish is probably aquarist's most favored species of knifefish!
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Klaus - 2012-10-20
I have 2 knifefish (in the same tank mind you) and I've been wondering would I be able to put some Angelfish in with them I'm also interested in clown loaches, any advice?

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  • Jeremy Roche - 2012-10-20
    In a large tank itshould be fine.
  • mrbob - 2014-10-03
    The angels will become dinner should be housed with other large non aggressive fish.
David - 2010-05-22
Can I keep a clown knife in a 20 gallon tank with 3 Black Ghost Knifes, 2 Butterflyfish, 4 Elephantnose, 1 Bichir, and 1 Red-tailed Shark? I also have three apple snails. Would the Clown Knifefish damage my Amazon sword plants or my water lilies?

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  • Daniel - 2010-06-29
    Dude No way, that's already waaay too many fish for a 20 gallon tank. Get a 125 at least if your bgk and nosers are getting along.
  • Anonymous - 2010-10-13
    Yes they will get along but you have too many fish in that tank, you might want to upgrade soon.
  • Warren - 2010-10-15
    You can keep a clown knife with your fish in a 20 gallon temporarily. A clown knife is a large growing fish and would out grow a 20 gallon and your other fish.
  • Shaun - 2010-10-18
    No i would not keep this fish in anything smaller than 125g+. It will be a 20+ inch monster. I would also not get the ghost knifes as they will get 20+.
  • Evelyn McCloy - 2014-09-30
    Only if you add three oscars and several Dow's cichlids, and, space permitting, a goat or two-rick
  • ananya - 2014-10-02
    are you crazy David??!!!20 gallon for all those fish. Please tell me you are joking..
Max miller - 2013-04-05
I have a gold clown knife and he is in a 45 gallon. Can he live in there forever with other 3 cichlids?

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  • Jasmine Brough Hinesley - 2013-04-05
    If he gets along fine with the cichlids, there is no reason they can't stay together. My main concern would be that the tank is too small. These knifefish can get quite large and a 45 gallon tank will not be big enough in the long term.
  • Benny Moreno - 2013-06-14
    yes he can, mind did.
  • Evelyn McCloy - 2014-09-30
    Given that cichlids comprise such an extremely large family, and with so many varying traits, and sizes it is impossible to say that fish A will get along with cichlids.  You need to be more specific; i.e., what would do well with a severum would not be sure to be best buds with a Midas cichlids-----rick
Anonymous - 2014-09-06
Hi did clown knife fish eats floating foods?

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  • David Brough - 2014-09-07
    Probably not, the bulk of their diet should be live foods, and they may take some pellet foods. Flake foods tend to float and they won't be too crazy about it.
Divina Pascual - 2014-09-05
Hi did clown knife fish eats floating foods?

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  • Clarice Brough - 2014-09-07
    Hi there, see the answer to your question below:)
Blonde - 2014-06-17
My boyfriend's nephew told him about an aquarium abandoned in the garage of a vacant house and living w/o electricity for an unknown period of time. In it were the Clown Knife, 2 clear Indian glass fish, a tropical black catfish, a Gobie(sp?) and some nearly see-through rod-like flat nose one that had a strange, flat head. The last 2 died w/in a week or two, but the rest are fine, despite our learning as we went. We had to separate the Clown Knife since the catfish became aggressive toward her and she towards the glass fish. Now she lives alone in a 55 gal. having gone from 4' to approx. 9-10' already. We still don't really know how much to feed her and worry when she scoops up a big mouthful of jagged rocks and spits them out when foraging, so we began giving feeder fish every other day or so along with about 1/2 a thimble of slow-sinking food daily supplemented by my daily dig for yard worms to satisfy her huge appetite. Percocet says not to feed her more than her eye size but that seems unfair due to her size. Any advice? I'm proud that she's so happy and relaxed now (and demanding)! She has personality, too rubbing her nose up and down on the glass like a dolphin frantically when we approach as if anticipating another fish to munch. We've got an underwater fan to keep food from settling into the rock substrate and 2 filters including a UV. She loves her rock 'castle' and will chase/nip any tool used to stir up the rocks inside. Very territorial, indeed! She likes me to get close to the glass to study my eyes and mouth when I talk. If I move away, she follows me. She swims around fast, making fast turns to get our attention and relaxes once she has it. If she fails, she goes into hiding. Is there anything else we can feed to ensure a good diet? I don't feel right giving her live fish, although her activity-level has risen exponentially as a result. My backyard has even become a daily dig site for worms - of which she has about 2-3/day.

Benny Moreno - 2013-06-14
I had a clown knife fish on time and I use sit there and watch it.

Rocco Restelli - 2013-04-18
My fish seems to be going blind? Eyes seem different tha n normal. Please help.

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  • Clarice Brough - 2013-04-23
    There are a couple different eye problems that fish can have. You might be able to figure out  what's going on from the info on the Fish Diseases; Eye Problems page.
renee moore - 2012-11-23
I have a 8 inch clown knife fish inside a 75 gallon is that fine?

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  • Jeremy Roche - 2012-11-23
    It will do fine in that sized tank!  Just make sure to have adequate filtration.
N - 2012-11-26
I have 2 clown knife fish in the same tank, and I am wondering how much longer I'd be able to keep them together; any suggestions?

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  • Jeremy Roche - 2012-11-26
    How big is your tank?
  • Clarice Brough - 2012-11-26
    These are such cool fish! They aren't really aggressive, but each fish does need its own space to prosper. As it says above, a 55 gallon tank will work fine for until they reach about 10'.  But with two, I think you would want to give them even more room (and ultimately a 200 gallon tank or so).