HomeCompare fishRed discus vs Threespot eartheater Red discus vs Threespot eartheater: 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 sideRed discusThreespot eartheaterAdult size18 cm (7.1 in)17 cm (6.7 in)Minimum tank210 L (55 US gal)210 L (55 US gal)Temperature27–33°C (81–91°F)23–28°C (73–82°F)pH4.2–6.56.3–7.0Hardness–5–10 dGH (89–178 ppm)TemperamentPeacefulPeacefulCare levelModerateModerateDietCarnivoreOmnivoreSpecies profilesRed discusSymphysodon discusThreespot eartheaterSatanoperca daemon