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Black Ghost Knife Fish 6cm (Apteronotus albifrons)

Black Ghost Knife Fish 6cm (Apteronotus albifrons)
  • Buy 5 for $20.60 each and save 12%
  • Buy 10 for $18.80 each and save 20%

Availability: In stock



This jet-black fish is a real one-of-a-kind and will add instant appeal to your fishtank.

Ghost knifes (or knives maybe?) can swim forwards, backwards, sideways, upside-down and pretty much any other angle - fascinating to watch. They can grow quite large, up to 30cm if kept in a large tank and are well looked after on average, but known to grow up to 60cm and live over 7 years given the right conditions.

They prefer live foods like bloodworm, Brine Shrimp, meaty frozen foods, worms and small feeder fish but can be trained to eat regular flakes or pellets, peas, earthworms and frozen community fish foods. Ghost knifes like to have a place to hide, but are very active and can be spotted at almost any time of the day, they do like a planted Aquarium as this gives options for hiding.

It is best not to keep too many ghost knifes together, as they will argue if they don't have their own space. However, they will cohabit happily with a wide variety of other peaceful aquarium fish.

Approximate purchase size: 6cm Water quality, Enjoys soft neutral to slightly acidic water: Temperature: 23 - 28 degrees pH: 6.5- 7.5 General Hardness less than 200ppm
Additional Information

Additional Information

Scientific Name No
Size 6

Customer Reviews 25 item(s)

BGK happy
My little BKG is certainly not shy. Made himself right at home, no signs of stress from the long haul to Cairns. Can't wait to see him grow. Thank LV.
Customer Rating
Review by Maddi / (Posted on 9/10/2018)
So fabulous he dances with my Black tetras
This guy is a survivor. He arrived with his bag torn and he huddled in the deepest water corner he could find (less than a cm) within the box. I put him in the tank immediately without proper adjustment procedure to get him to water fast and he survived. Within 3hrs he was trucking along fine and 4months later still happy and about 2cm larger.
He has a cave that he rarely uses and spends most of the time inspecting the tank and dancing with my black tetras / spanish dancers. He has no problem with any fish and when he chills out the Kuhil loaches stick near him for some reason. He tries stealing food from my Albino Catfish but isn't fast enough. When he is irritated by my Shinbukin 'Haduukin' fossicing he zaps him, but that is sporadic at best.
Black Ghost Knifefish have been a favourite since childhood and like my first one 'Wolfgang' that had become a childcare centre pet (at 25cm) is entertaining and active.
Customer Rating
Review by Vanessa / (Posted on 29/01/2016)
good looker
Pleasant surprise on arrival much better than I was expecting. Had it a week now and eating like crazy.
Customer Rating
Review by Bryn / (Posted on 3/12/2015)
Great addition.
I got two of these guys, They are the most unique swimmers. I could watch them swim around the tank all day!
Customer Rating
Review by Donald / (Posted on 11/08/2015)
Thank you . "Phantom" is in the tank. Arrived well and healthy.
Customer Rating
Review by Helen / (Posted on 14/05/2015)
Awesome to watch, arrived a few days ago perfectly healthy and loves to hide. Thanks livefish
Customer Rating
Review by Steven / (Posted on 15/08/2014)
Very special
Love these now now two from Livefish very healthy and fun to watch. has set up home with the cray in a cavern they have excavated under one of the ornaments.
Customer Rating
Review by lynne / (Posted on 11/08/2014)
Seems very shy at first, but is becoming more active and visible.
Customer Rating
Review by Jarrod / (Posted on 25/07/2014)
Very happy
I was surprised how quick it got here and how healthy it is really happy
Customer Rating
Review by Jojo / (Posted on 30/10/2013)
Fish arrived healthy and in good time would highley recomend to anyone
Very Happy with product and would highley recomend to anyone
buying fish
Customer Rating
Review by Willy / (Posted on 20/09/2013)
Pure Awesomeness
I bought 2 of these guys, I would of purchased more but I was ordering alot of items and it was starting to get a bit expensive in my cart.

I now Regret it.

I wish I had bought more!!!

These guys are soo cute and adorable, very active, arrived very quickly, and in healthy condition.

I've been hand feeding them bloodworms.

And i'm definitely going to buy more of these guys in my next order.

Whats the tank size to ghostknife fish ratio?

Also how do you tell which is male and female?

I was a bit skeptical about ordering fish online, but this site is legit, And they arrived fast. Upon receiving a e-mail about when the fish will be ready to fish, and the next e-mail to tell you when they've been sent, you can track it online, to know exactly when it will arrive.

Add me i've got pictures.
Customer Rating
Review by MarionetteVexia (Facebook ID) / (Posted on 8/08/2013)
One of my favourites!
Excellent fish! I just love to sit there and watch them manoeuvre around, that is when they come out from hiding of course! At the moment he is small enough to live in my community tank, Ill have to keep an eye on my neon tetras if he starts growing ;)
Customer Rating
Review by Shane / (Posted on 19/07/2013)
beautiful fish .... BUT
if all your smaller fish are disappearing guess who it is!! amazing to watch a guppy disappear down a ghost knife's throat !!
Customer Rating
Review by david / (Posted on 18/10/2012)
Love Love Love it
We got 1 of these as suggested by someone and were told they were a fish that hid alot but ours is always out and just looks the best in our set up. Though he is still very small compared to how big they get he fits and suits our tank well. We are so happy we got a Ghost knife. He came fit and healthy and didnt seem to be in shock at all
Customer Rating
Review by Amanda / (Posted on 10/08/2012)
Excellent service indeed
Have purchased two of these fish...awesome critters and great addition to a community tank...definitely a unique personailty and kids adore watching them eat from my hands at feeding time.
Even quite adventurous if not too bright in the room...occasionally draw the curtains and turn off tank light to watch them come out to play.
Both my two interact together from time to time...and they seem to like playing together in the stream of air bubbles...fascinating for young and old to watch.
Customer Rating
Review by rebecca / (Posted on 25/07/2012)
Very healthly and happy on arrival, was smaller then expected but it is better for the tank is he in now. He was a little shy when i put him in with Siamese fighter and baby severums (which i also got from here) but he is now swimming around very happily. He looks very beautiful and i'am very happy with him.
Customer Rating
Review by Amy / (Posted on 21/07/2012)
Black Ghost Knife
Arrived healthy, but very shy. He hid for just short of a week. Now he is settled in & just so fasinating to watch. Truly an amazing fish, and really enjoys eating shrimp!
Customer Rating
Review by Willow / (Posted on 17/05/2012)
Bought two of these for a bit of contrast and something different. Sadly lost one the next day. But the other is going great, very playful interesting fish.
Customer Rating
Review by Kyle / (Posted on 12/03/2012)
Got my new Black Ghost Knife this morning.
I'm a first time customer and I have to admit I was suspicious about how it would make the trip to Melbourne.
Absolutely stoked! He (Blade!) is in perfect health and is happy and cruizin round all over the tank.
He looks more healthy than most of the fish in aquariums around Melbourne!
Anyway, will be buying from these guys again.
Customer Rating
Review by Mark / (Posted on 18/01/2012)
Great buy
I bought this little guy to replace another larger one that died. It arrived happy and healthy and although it mainly hides away at the moment, I look forward to it gaining some confidence.
Customer Rating
Review by Nick / (Posted on 23/11/2011)
New arrival
My beauty has just arrived in the box, after some slow water adjustment my BGK is happy as can be. Such an amusing and funny creature and this only after watching him/her for about an hour!

Well done LF, well done indeed.
Customer Rating
Review by Tim / (Posted on 15/09/2011)
great species runs after each other always going in and out of hiding places and love breakfast time when they get blood worms. works well with rams discus and tetras
Customer Rating
Review by Nathan / (Posted on 3/06/2011)
knife fish
it seems to be very shy at the moment finding a place to hide with everone else but is an awsome fish none the less, so cool to watch swim back and forth
Customer Rating
Review by josh / (Posted on 11/02/2011)
Very beautiful fish
fish arrived happy and healthy, very happy with this sites service
Customer Rating
Review by Conor / (Posted on 17/12/2010)
BKG Fish
Got my BKG Fish today
Arrived in good health and looks great
Playful and happy

Customer Rating
Review by Cody / (Posted on 24/06/2010)