Brown Ghost Knifefish tank mates
Apteronotus leptorhynchus
4 rated pairings from the Brown Ghost Knifefish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Brown Ghost Knifefish needs at least 40 gallons on its own; every companion adds to that.
Good matches
4 · Compatible with normal care — watch space and numbers.
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Small, peaceful bottom-dweller that won't trigger predatory behavior and shares similar water preferences
German Blue Ram
Mikrogeophagus ramirezi
20 gal min · 3" adult · Peaceful
Peaceful dwarf cichlid that occupies different zones and tolerates slightly acidic conditions
Diamond Tetra
Moenkhausia pittieri
15 gal min · 2.5" adult · Peaceful
Mid-water schooling fish that avoids the bottom zone where knifefish hunt
Bristlenose Pleco
Ancistrus sp.
20 gal min · 5" adult · Peaceful
Nocturnal bottom-dweller with similar activity patterns and compatible water chemistry
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.