Petroleum, a fossil fuel, supplies more energy to the world today than any other source. The United States is the world's leading consumer of petroleum; in 1994, Americans used 7,587,000 barrels of oil per day.
Frequently test for ammonia and nitrite (you want both to measure zero). A pH test is also handy to ensure your goldfish's water is not too alkaline or acidic. This can be purchased at any pet store. Do not modify the fish's water, however, unless it is significantly different from neutral.
Water changes help keep a constant high quality goldfish water. This means a lot less worries for you and your family. What you need for a water change: 1  gravel cleaner. 2  5-gallon bucket. 3  water conditioner. 4  old cloth towels.