The goldfish (Carassius auratus) is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish and come in several varities and colors.
The goldfish is generally considered a coldwater fish, preferring temperatures between 60-70°F with different varieties have preferred ranges. They will thrive in a higher ph range of 7.2-7.6 and require a tank size of 20 gallons per fish with heavy filtration as they produce alot of waste. Fancy varities with long fins should not be kept in aquariums with high water flow as they will struggle to swim. Their food needs will differ slightly depending on temperature and activity level. Goldfish will thrive on goldfish specifc foods which includes pellets and various mixtures of protein and plant matter.
Because goldfish eat live plants, their presence in a planted aquarium can be problematic. Only a few aquarium plant species (for example Cryptocoryne and Anubias) can survive around goldfish, but they require special attention so that they are not uprooted.