Goldfish are available for purchase from many different online sources. For example, Buy Goldfish Online sells a variety of fancy goldfish and ships next day air. Other online sources of goldfish include Live Aquaria, Li... More »

Several online aquarium stores offer goldfish for sale, including PetSolutions and Both these stores offer a variety of goldfish, some of which are not available at standard pet stores. Specialty goldfis... More » Pets & Animals Pets Aquatic Pets

Some brick-and-mortar aquarium shops as well as online sites, such as and, offer piranhas for sale. Many states strictly control or prohibit ownership of piranhas. More » Pets & Animals Pets Aquatic Pets

Goldfish usually do best when fed two or three times per day. At each feeding, it is best to put a small amount of food in the tank. If the goldfish eats all the food within one or two minutes, a second helping of simila... More »

Goldfish tend to attack each other when a food source is scarce. Increased competition for dwindling food sources leads to a fight for the food. More »

Goldfish, as a result of having gills, require oxygen in order to survive. Encyclopædia Britannica references that all fish have gills, which are used to exchange oxygen and carbon dioxide with the surrounding water. Gol... More »

Minnows and Danios are some fish that can live in the same tank as Goldfish. However, it is best that no other fish are in the tank with them. More »