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.
Feeding goldfish in ponds is a little different. To be honest with you depending on the size of pond you have and how many fish you have in it you donât really need to feed your fish. There is enough live food, bugs, insects and algae in the water that they will live just fine.