Question: what is the best temperature for discus fish?
Answer: Discus prefer warm, soft, acidic water. pH should be between 6.0 and 7.0, with hardness between 1° and 4° dKH (18 to 70 ppm). Temperature should be kept between 82° and 86° F, although wild Heckel discus prefer water near 90° F. Use an Aqueon Aquarium Heater to maintain proper water temperature.