There are a few species that can survive alongside goldfish, including Zebra Danios and White Cloud Mountain Minnows. These fish should never be added to a goldfish tank if the goldfish inside are larger than they are, since large goldfish may eat them. Goldfish should optimally be kept in a tank only with other goldfish.Know More
Experts warn that the unique needs of the goldfish can't be adequately met with other types of fish in the same tank because goldfish really thrive best with other goldfish in low-temperature tanks. Never mix tropical fish with goldfish since tropical fish need a warmer tank and have different nutritional requirements to goldfish, which makes it impossible to feed both types of fish adequately. Goldfish are also fast eaters, often pushing slower, smaller fish out of the way in order to eat.
Goldfish are considered peaceful fish, while many types of tropical fish can be aggressive. Keeping goldfish and tropical fish in the same tank together can cause injury to the goldfish, including nipped fins and more serious bites.
Because goldfish are social creatures and enjoy company, it is a good idea to keep them together with other goldfish of similar size and shape. Keeping different species of goldfish in one tank is also not recommended.Learn more about Aquatic Pets
Although there is little proof, rare cases have indicated the possibility of cannibalism in goldfish. The National reported an incident in which goldfish ate other fish after an earthquake, leaving them of food for an extended period of time.Full Answer >
For live-bearing fish, the pregnancy length depends on the species of fish and varies considerably. For instance, according to the MCH Portal, platies have a gestation period of up to 7 weeks. On the other hand, mollies have pregnancies of about 4 weeks, according to Fish Lore.Full Answer >
When kept in captivity, goldfish live anywhere from a few months to 45 years depending on the size of their habitat and how well they are cared for. Goldfish kept in bowls have the shortest lifespan; with proper cleaning and feeding, they can survive for about five years.Full Answer >
A number of quick, relatively painless methods have been devised to humanely dispatch fish. A commonly used method is clove oil to anesthetize the fish, followed by an alcohol bath to kill the fish. Another option is to add eight Alka-Seltzer tablets per gallon of water, which releases carbon dioxide to kill the fish quickly. However, RateMyFishTank.com suggests freezing the fish afterwards to ensure that it is dead.Full Answer >