Black Ghost Knifefish tank mates
Apteronotus albifrons
4 rated pairings from the Black Ghost Knifefish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Black Ghost Knifefish needs at least 100 gallons on its own; every companion adds to that.
Good matches
2 · Compatible with normal care — watch space and numbers.
Bristlenose Pleco
Ancistrus sp.
20 gal min · 5" adult · Peaceful
Nocturnal bottom-dweller with similar habitat preferences; non-aggressive and unlikely to compete for food
Upside-Down Catfish
Synodontis nigriventris
20 gal min · 4" adult · Peaceful
Peaceful nocturnal catfish that occupies different feeding zones and won't trigger predatory response
Use caution
2 · Works in the right setup; read the note before combining.
Cardinal Tetra
Paracheirodon axelrodi
15 gal min · 2" adult · Peaceful
Small schooling fish; may be viewed as prey if they venture into the knifefish's territory at night
Rummy Nose Tetra
Hemigrammus rhodostomus
15 gal min · 2" adult · Peaceful
Fast-moving schooling fish that generally avoid the knifefish but require careful monitoring
Also recommended alongside Black Ghost Knifefish
Species whose own guides list Black Ghost Knifefish as a tank mate.
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.