HomeCompare fishBlack ghost vs Elephantnose fish Black ghost vs Elephantnose fish: can they live together? Verdict: Not recommendedThe Elephantnose fish is aggressive towards other fish.The Black ghost is aggressive towards other fish.The Black ghost grows about twice as long as the Elephantnose fish; watch for bullying or predation.Both are comfortable at 23–28°C (73–82°F).A pH of 6.0–7.0 suits both.Side by sideBlack ghostElephantnose fishAdult size50 cm (20 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)pH6.0–8.06.0–7.0Hardness5–10 dGH (89–178 ppm)5–19 dGH (89–339 ppm)TemperamentAggressiveAggressiveCommunity tankGoodWith cautionCare levelModerateDifficultDietOmnivoreOmnivoreSpecies profilesBlack ghostApteronotus albifronsElephantnose fishGnathonemus petersii