HomeCompare fishBlack ghost vs African bonytongue Black ghost vs African bonytongue: can they live together? Verdict: Not recommendedThe African bonytongue is aggressive towards other fish.The Black ghost is aggressive towards other fish.The African bonytongue grows about twice as long as the Black ghost; 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 sideBlack ghostAfrican bonytongueAdult size50 cm (20 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)pH6.0–8.06.7–7.5Hardness5–10 dGH (89–178 ppm)4–12 dGH (71–214 ppm)TemperamentAggressiveAggressiveCommunity tankGood–Care levelModerateDifficultDietOmnivoreCarnivoreSpecies profilesBlack ghostApteronotus albifronsAfrican bonytongueHeterotis niloticus