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· Reference Team
7,846 Posts
Vilmarisv has the best suggestion.

I use (well)water straight from the tap, so I place my cups (with Betta in) between two layers of thick towels. I only lose a degree or two with this method. (I use a digital thermometer, so I know.)

And, of course I float them in the new tank water to get them up to temp before acclimating.
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