What’s the best way to move fish from an established aquarium to a new aquarium?

Lost OC Boy asked:


I have about ten tropical fish in a 12 gallon aquarium that has been established for a little more than two years. I recently purchased a 25 gallon aquarium and have let it run with water (but no fish) for a week now. How should I begin transitioning the fish from the old aquarium to the new one?

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