Diagnose a goldfish's problem by examining its symptoms and possible causes. Some symptoms, such as sluggishness, can point towards multiple conditions. Goldfish can suffer from a number of diseases, such as anchor worm,... More »

Remove a sick goldfish to a separate, smaller tank to prevent the spread of disease and to observe it closely. Check for specific symptoms such as droopy fins, a bloated abdomen, rapid movement of gills, spots on the ski... More »

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A goldfish indicates stress by gasping at the surface of the tank, refusing to eat, swimming in strange patterns or developing white spots on its body known as "ich." A goldfish may also develop fungus or a bacterial inf... More »

Types of goldfish that have oversized eyes include bubble eyes, celestials, telescopes and black moors. A fifth type of large-eyed goldfish is the demekin, which is a cross between the telescope variety and the arch-bodi... More »

Goldfish hover near a shelter at the bottom of the tank for short periods throughout the night when sleeping. Goldfish don't have eyelids, so when sleeping it can appear that they are just being inactive. More »

The Guinness Book of World Records lists the world's largest goldfish in 2013 as being 18.7 inches long. In 2013, a goldfish caught in Lake Tahoe weighed 4.2 pounds and measured 1.5 feet long. Many other cases of goldfis... More »

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 »