HomeCompare fishGlass knifefish vs Elephantnose fish Glass knifefish vs Elephantnose fish: can they live together? Verdict: Not recommendedThe Elephantnose fish is aggressive towards other fish.The Glass knifefish is best kept in a species tank.The Glass knifefish is aggressive towards other fish.Both are comfortable at 23–28°C (73–82°F).A pH of 6.0–7.0 suits both.Side by sideGlass knifefishElephantnose fishAdult size35 cm (14 in)23 cm (9.1 in)Minimum tank210 L (55 US gal)115 L (30 US gal)Temperature23–28°C (73–82°F)23–28°C (73–82°F)pH6.0–7.56.0–7.0Hardness2–15 dGH (36–268 ppm)5–19 dGH (89–339 ppm)TemperamentAggressiveAggressiveCommunity tankNot suitableWith cautionCare levelDifficultDifficultDietCarnivoreOmnivoreSpecies profilesGlass knifefishEigenmannia virescensElephantnose fishGnathonemus petersii