Black ghost vs Glass knifefish: can they live together?

Verdict: Not recommended

  • The Glass knifefish is best kept in a species tank.
  • The Glass knifefish is aggressive towards other fish.
  • The Black ghost is aggressive towards other fish.
  • Both are comfortable at 23–28°C (73–82°F).
  • A pH of 6.0–7.5 suits both.

Side by side

Black ghostGlass knifefish
Adult size50 cm (20 in)35 cm (14 in)
Minimum tank210 L (55 US gal)210 L (55 US gal)
Temperature23–28°C (73–82°F)23–28°C (73–82°F)
pH6.0–8.06.0–7.5
Hardness5–10 dGH (89–178 ppm)2–15 dGH (36–268 ppm)
TemperamentAggressiveAggressive
Community tankGoodNot suitable
Care levelModerateDifficult
DietOmnivoreCarnivore

Species profiles