Glass knifefish vs African bonytongue: can they live together?

Verdict: Not recommended

  • The African bonytongue is aggressive towards other fish.
  • The Glass knifefish is best kept in a species tank.
  • The Glass knifefish is aggressive towards other fish.
  • The African bonytongue grows about twice as long as the Glass knifefish; watch for bullying or predation.
  • Both are comfortable at 24–28°C (75–82°F).
  • A pH of 6.7–7.5 suits both.

Side by side

Glass knifefishAfrican bonytongue
Adult size35 cm (14 in)100 cm (39 in)
Minimum tank210 L (55 US gal)455 L (120 US gal)
Temperature23–28°C (73–82°F)24–30°C (75–86°F)
pH6.0–7.56.7–7.5
Hardness2–15 dGH (36–268 ppm)4–12 dGH (71–214 ppm)
TemperamentAggressiveAggressive
Community tankNot suitable–
Care levelDifficultDifficult
DietCarnivoreCarnivore

Species profiles