A fish tank is a nice addition to a home. You will need to purchae an aquarium, the more fish you with to have the bigger it needs to be. Once you have it, you will need to add the water as well as the water pump. This will filter in oxygen for your fish. The bottom should have gravel or decorative sand or rocks and you will need plants as well. Some people add coral or large rocks for decor as well. Once your fish tank is set up, you can add your fish. Just remember to feed them daily and clean out the tank once a week.