If you are considering buying an aquarium, you have probably been doing internet research for some time. There are many brands, and a wide choice of tanks (different volumes, sizes, shapes, finishes, etc) are available.
Fully equipped aquariums are often a good starting point for beginners or small budgets, as long as you choose a tank large enough, as goldfish need comfortable swimming space and water volume to thrive. In general, the larger the tank, the easier it will be to maintain. In addition to the size of the tank, its volume and design, you must also consider the aquarium filter, heating, lighting and substrate (soil and gravel).
Here are some important points to consider when purchasing an aquarium, as well as practical information on placing, installing and maintaining your aquarium: