You might think a bowl suffices, but you’re wrong. It’s a misconception that your goldfish requires smaller tanks and bowls as opposed to other fishes and aquatic animals. The larger the tank, the happier your fish! The ideal measurements are:
Length = 4 x adult body length (172m)
Width = 2 x adult body length
Height = 3 x adult body length
It is very important to not feed your fish more than required. It leads to problems in their fragile digestive system, and in some cases also prove fatal.
Goldfish are prey animals and require plant cover to prevent stress and accelerate activity. Plants also provide a lot of healthy enrichment.
Goldfish are heavy feeders and really high waste producers and require efficient filtration regularly. You have to make sure the water is oxygenated and that the tank is cleaned often to enable your fish a healthy life.
Goldfish are social animals, so you should get your pet another friend to share the tank with! It helps them with their growth and they live longer!