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.
You will want to make sure you clean and change the goldfish bowl. Cold-water fish such as goldfish are way more sensitive than you may imagine. Moving them into water thatâs a different temperature, or thatâs come straight from the tap and so has a high chlorine content, can make them die of shock.