HomeCompare fishSlim betta vs Black ghost Slim betta vs Black ghost: can they live together? Verdict: Not recommendedThe Black ghost is aggressive towards other fish.The Slim betta can be semi-aggressive or nip fins.An adult Black ghost is about 5 times the length of a Slim betta and may eat it.Both are comfortable at 24–28°C (75–82°F).A pH of 6.5–7.5 suits both.Side by sideSlim bettaBlack ghostAdult size10 cm (3.9 in)50 cm (20 in)Minimum tank75 L (20 US gal)210 L (55 US gal)Temperature24–30°C (75–86°F)23–28°C (73–82°F)pH6.5–7.56.0–8.0Hardness5–15 dGH (89–268 ppm)5–10 dGH (89–178 ppm)TemperamentSemi-aggressiveAggressiveCommunity tankGoodGoodCare levelEasyModerateDietOmnivoreOmnivoreSpecies profilesSlim bettaBetta bellicaBlack ghostApteronotus albifrons