Above 20 °C, water loses some of its oxygen, and cold-water fish such as trout, salmon, charr and grayling quickly suffer. A chiller cools the water to the set temperature, like a refrigerator connected to the filtration circuit; some models also heat in winter. Choose it by volume, from 150 to 6,000 L in this collection.
For an aquarium in a warm room, a cooling fan is often enough: it lowers the water temperature by a few degrees through evaporation. The article Salmoponics, cold-water aquaponics explains what salmonids need.








