![]() Canister filters can be a good choice for a large goldfish tank. The tank water passes through the filter unit, where it’s cleaned and then returned to the tank. Canister FilterĬanister filters are large, external filter units that are usually kept in the cabinet underneath your aquarium. The outflow of many internal filter systems can generate too much flow for slow-swimming Fancy goldfish to be comfortable. ![]() Internal filters are not the best choice for goldfish, as they hog too much space in the tank, and cleaning them can be a messy business. Water passes through the unit, over the filter media, and out again via an outflow. Internal filters live inside the tank, usually fixed to the glass by rubber suckers. Like the HOB filter, everything is housed inside a plastic casing. They don’t take up any space inside the tank, and the water effect return system agitates the water surface, helping to oxygenate the water. HOB filters can be a good choice for a goldfish tank. Water is drawn from the tank, passed through the filter media, and returned to the tank via a cascade, waterfall outlet effect. Here are some of the best filters for goldfish tanks: HOB (Hang-On-Back) FilterĪs you might expect from the name, HOB filters are external filter units that you fix to the back of your tank.Īll the filter media and other paraphernalia are housed inside a plastic casing. There are several different types of filter systems that are commonly used in home fish tanks. Goldfish are dirty fish that create lots of waste, so you’ll need an efficient filter system to process the waste and keep the water safe for your fish. Add 10 gallons (37L) to the tank’s capacity for every additional goldfish.Īlthough adult Fancy Goldfish aren’t generally known as jumpers, the tank should have a lid or a cover slide to prevent dust from contaminating the water and preventing any unexpected escapes! The minimum tank size for goldfish should be 20 US gallons / 75 UK Litres for the first fish. So, goldfish should always be kept in small groups or pairs, never alone. Goldfish are sociable creatures that are happiest when kept in the company of their own kind. We recommend a rectangular-shaped fish tank for goldfish, as that provides plenty of surface area and swimming space. ![]() Goldfish are oxygen-hungry fish, and a round, bowl-shaped container doesn’t have a big enough surface area for efficient gaseous exchange. Goldfish of all types can grow pretty large, and a traditional goldfish bowl doesn’t provide sufficient swimming space for the fish once they’re fully grown. Fish Tankįirst of all, we must stress that you should keep goldfish in a tank, not in a bowl. Now, let’s look in more detail at the equipment you’ll need to set up your goldfish tank. What equipment do you need to set up a fish tank? ![]()
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