Cooling Aquarium down as Temp >30c

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Mick Vallis

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Oct 28, 2019
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Location
Hampshire, UK
Tankcool.jpg
 
This is the season where aquarists all over the world are trying things to save their fish from the heat. It's lovely and cool where I am, but a lot of people here are in seriously hot places right now.
 
How warm is the water getting?
Most rainbowfish can take 30C water for months. I had some outdoors in containers and the temperature hit 40C+ during the day. As long as there's good aeration and the temperature doesn't go up or down rapidly, they should be fine for a few weeks.

Reduce feeding and increase aeration/ surface turbulence to maximise the oxygen levels in the water.

Do regular water changes and gravel cleans to keep the water cleaner (harmful disease organisms grow faster in warm water).

Make sure the filter is cleaned regularly.

Make sure you dechlorinate tap water before adding it to the aquarium. Water companies increase the chlorine or chloramine levels when the water warms up.
 
How warm is the water getting?
Most rainbowfish can take 30C water for months. I had some outdoors in containers and the temperature hit 40C+ during the day. As long as there's good aeration and the temperature doesn't go up or down rapidly, they should be fine for a few weeks.

Reduce feeding and increase aeration/ surface turbulence to maximise the oxygen levels in the water.

Do regular water changes and gravel cleans to keep the water cleaner (harmful disease organisms grow faster in warm water).

Make sure the filter is cleaned regularly.

Make sure you dechlorinate tap water before adding it to the aquarium. Water companies increase the chlorine or chloramine levels when the water warms up.
This is just a "radiator" with cool water running through to drain.
I do 6 weekly water changes of about 75% via a RO unit.
Not only Rainbows, Tetra's, Bristle nose, Clown Loaches & Shrimp (large).
 
I'm in a different climate, although predictability is out the window.
I run a fan in the window at night, to cool the room down. Then I darken up for the day, with fans. But I'm dealing with 26 outside (but with killies and Gabonse fish that dislike temps above 22). When I lived in a region that got the kind of heat you're in (35 plus) I gave up and air conditioned the fishroom.
Small mini-heat pump systems are a big thing here, with our extremes in hot and cold. When I was in England I was struck by how the systems in buildings weren't designed for what has happened to the climate. The last time I was in London in summer, it was as hot as central North America.
 
I'm in a different climate, although predictability is out the window.
I run a fan in the window at night, to cool the room down. Then I darken up for the day, with fans. But I'm dealing with 26 outside (but with killies and Gabonse fish that dislike temps above 22). When I lived in a region that got the kind of heat you're in (35 plus) I gave up and air conditioned the fishroom.
Small mini-heat pump systems are a big thing here, with our extremes in hot and cold. When I was in England I was struck by how the systems in buildings weren't designed for what has happened to the climate. The last time I was in London in summer, it was as hot as central North America.
Water fans didn't really work for me, looked into Chiller units but issue not often enough to justify cost. This prolonged temp is unusual for June & July, normally an issue Aug into Sept. Aquarium will cope with high external temps for a few days but when over a week temps build up.
 
I'm in the south of the UK. With tropical fish, there is no need to go to any trouble trying to chill the water. Just ensure very good surface agitation to keep as much available oxygen for the fish as possible.
 

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