HomeCompare fishDemon eartheater vs Threespot eartheater Demon eartheater vs Threespot eartheater: can they live together? Verdict: CompatibleBoth are comfortable at 23–28°C (73–82°F).A pH of 6.3–7.0 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sideDemon eartheaterThreespot eartheaterAdult size25 cm (9.8 in)17 cm (6.7 in)Minimum tank210 L (55 US gal)210 L (55 US gal)Temperature23–28°C (73–82°F)23–28°C (73–82°F)pH6.3–7.06.3–7.0Hardness5–10 dGH (89–178 ppm)5–10 dGH (89–178 ppm)TemperamentPeacefulPeacefulCare levelModerateModerateDietOmnivoreOmnivoreSpecies profilesDemon eartheaterSatanoperca jurupariThreespot eartheaterSatanoperca daemon