I do not preheat the water that I use for water changes. I make the water up a few days in advance, so the water gets to ambient air temperature which is never far off from the temp of the display tank. I have yet to notice so much as a one degree temp change doing this, though it certainly may seem a bit lax.
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Republicans - \ri-ˈpə-bli-kənz\ noun: America's other left wing.
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