HomeCompare fishGlass knifefish vs Lesser spiny eel Glass knifefish vs Lesser spiny eel: can they live together? Verdict: Not recommendedThe Lesser spiny eel is aggressive towards other fish.The Glass knifefish is best kept in a species tank.The Glass knifefish is aggressive towards other fish.Both are comfortable at 23–28°C (73–82°F).A pH of 6.5–7.5 suits both.Side by sideGlass knifefishLesser spiny eelAdult size35 cm (14 in)38 cm (15 in)Minimum tank210 L (55 US gal)115 L (30 US gal)Temperature23–28°C (73–82°F)20–28°C (68–82°F)pH6.0–7.56.5–7.5Hardness2–15 dGH (36–268 ppm)6–35 dGH (107–625 ppm)TemperamentAggressiveAggressiveCommunity tankNot suitableGoodCare levelDifficultEasyDietCarnivoreOmnivoreSpecies profilesGlass knifefishEigenmannia virescensLesser spiny eelMacrognathus aculeatus