Goldfish produce a lot of waste, so having the right size filtration is key. The filter should be chosen according to your aquarium size. It should have at least a 4-time turnover in an hour. For example, a filter that has a 200-gallon flow rate is good for an aquarium up to 50 gallons.

There are many types of filters on the market, but you should choose a filter that has 3-stages: mechanical, biological, and chemical. Mechanical is trapping free-floating particulars from the water, biological is breaking down ammonia and nitrite and turning them into less harmful nitrate, and chemical is filtering of things that will change the chemical compounds of the water.
Here are some of the best filters for a goldfish aquarium:

The canister filter is an external filter that usually sits under the aquarium, it’s easy to install and maintain when sized properly. It is one of the best products out there, and you can fit a lot of filter media in it.
Hang on the back filter is probably the most common filter you’ll find. It is easy to maintain, and it sits on the back glass of the aquarium. This filter is a good option for beginners.
A sump filter is the best option for a big aquarium with a water volume of more than 100 gallons. It is made of glass or acrylic, and it has baffles in it. The water enters from one side, flows through all sorts of media, and is pumped back into the aquarium by a pump. Another benefit of a sump is it adds more water volume to the aquarium.

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