How should I fill my fish aquarium?

First, allow at least 1 gallon of water to run from the tap before using the water to fill the aquarium. This will flush any copper or zinc from copper or galvanized piping in your home; tropical fish are very sensitive to small amounts of copper or zinc in their water. Let the water sit in the aquarium for an hour or two until it reaches room temperature. Consult your local pet store to learn how to test for and remove any disinfectant in the water. You must remove disinfectants such as chloramine from the water before you add fish.