Responses to our questions ‘Mid-heatwave — how do you go about keeping your tanks cool when the mercury rises? Anyone ever cooled a pond?’
Ruben Braam: As long it isn’t this hot for weeks in a row, no worries here. Most fish can handle it for short periods.
Aaron Cornish: I turn the lights off and leave the hood open and that really helps. Also whack in an air stone or point filter outlets out of the surface to drive surface movement.
Mason Bell: Switch off the heater for a couple of days and keep the lid open.
Phil Roberts: Heaters off , not that they would be on anyway. Increase surface movement; bottles of iced water on standby just in case.
Howard Miatt: Small fan blowing across the surface of the water will cool it but increases evaporation, so you will need to do regular top ups.
Simon Cordey: Have a well insulated fish room like I do. 28°C year round. No need for heaters or coolers. Cooler loving fish go on lower racks.
Tessa Walsh: I made frozen RO ice cubes for my marine tank last year. It also helped with evaporation.
George Everett: My Infinity pool is at 25°C — I’ve lost four minnows and a Comet. All my air stones are in there already, with water changes and ice cubes on the go.
Paul Shelley: Why do people say ‘heater off ’. That’s a bad idea as the temperature might drop during the night. Turning heaters off during the day will do nothing to cool the tank as they are controlled by a thermostat and won’t heat the tank any higher if the water is already hot.
Beat the heat with an insulated fish house.