just done a hoover,and water change,had to replace a fair bit of water(due to hoover taking loads out!)replacing water i do with a hose,but obviously its cold water going into a tropical tank,i added a jugful with stress coat aswell,and some hot water mixed in(in a corner where fish wernt,and mixed with hose,so no hotspots)
How do you do water changes in a large tank,and manage the water temp during?? took me 2 hours.And tank under normal temp now.

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(formally clare7577)

You're only supposed to do 20% water changes at a time so its not very stressful on the fish. I heat the water until its at the same temp as the tank before I put it in. I have 200L not sure what you would consider large.

I suppose it would have been about that,mines 500L how do you heat your water? Trouble i have is tank hoover sucks out somuch water whilst cleaning and 4 big oscars leave sooo much mess I need a hoover that doesnt remove water,but that is long enugh to reach bottom of tank.(2ft)

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(formally clare7577)

Large water changes aren't as harmful as people like to make out, the trouble is keeping the temperature stable. What size of containers do you use for water changes? The most reliable method of heating water is to use aquarium heaters.