HomeCompare fishZig-zag eel vs Glass knifefish Zig-zag eel vs Glass knifefish: can they live together? Verdict: Not recommendedThe Glass knifefish is best kept in a species tank.The Glass knifefish is aggressive towards other fish.The Zig-zag eel is aggressive towards other fish.Both are comfortable at 23–27°C (73–81°F).A pH of 6.5–7.5 suits both.Side by sideZig-zag eelGlass knifefishAdult size38 cm (15 in)35 cm (14 in)Minimum tank475 L (125 US gal)210 L (55 US gal)Temperature22–27°C (72–81°F)23–28°C (73–82°F)pH6.5–7.56.0–7.5Hardness–2–15 dGH (36–268 ppm)TemperamentAggressiveAggressiveCommunity tankGoodNot suitableCare levelEasyDifficultDietOmnivoreCarnivoreSpecies profilesZig-zag eelMastacembelus armatusGlass knifefishEigenmannia virescens