I have two comet goldfish and unfortunately my tank temperature is about 78F which I know is a little high. I've put some treated ice cubes in their tank that they LOVE playing with, but I can't seem to get the temperature to come down permanently, and I'm scared that the fluctuations will harm them. They're already in the coldest part of my house... Should I continue with the cubes or just leave them be? They appear to be happy/healthy as it is.
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