HomeCompare fishHead-and-taillight tetra vs Slim betta Head-and-taillight tetra vs Slim betta: can they live together? Verdict: With cautionThe Slim betta can be semi-aggressive or nip fins.The Slim betta grows about twice as long as the Head-and-taillight tetra; watch for bullying or predation.Both are comfortable at 24–26°C (75–79°F).A pH of 6.5–7.5 suits both.Minimum tank for the pair: 75 L (20 US gal)Side by sideHead-and-taillight tetraSlim bettaAdult size5 cm (2 in)10 cm (3.9 in)Minimum tank75 L (20 US gal)75 L (20 US gal)Temperature22–26°C (72–79°F)24–30°C (75–86°F)pH6.0–8.06.5–7.5Hardness5–19 dGH (89–339 ppm)5–15 dGH (89–268 ppm)TemperamentPeacefulSemi-aggressiveCommunity tankExcellentGoodCare levelEasyEasyDietOmnivoreOmnivoreSpecies profilesHead-and-taillight tetraHemigrammus ocelliferSlim bettaBetta bellica