HomeCompare fishDemon eartheater vs Red discus Demon eartheater vs Red discus: can they live together? Verdict: CompatibleBoth are comfortable at 27–28°C (81–82°F).A pH of 6.3–6.5 suits both.Minimum tank for the pair: 210 L (55 US gal)Side by sideDemon eartheaterRed discusAdult size25 cm (9.8 in)18 cm (7.1 in)Minimum tank210 L (55 US gal)210 L (55 US gal)Temperature23–28°C (73–82°F)27–33°C (81–91°F)pH6.3–7.04.2–6.5Hardness5–10 dGH (89–178 ppm)–TemperamentPeacefulPeacefulCare levelModerateModerateDietOmnivoreCarnivoreSpecies profilesDemon eartheaterSatanoperca jurupariRed discusSymphysodon discus