Fish: You can get home one or two goldfish, or if you think you can handle more, you can get a small aquarium with a school of small fish. Looking after fish is pretty easy, one has to feed them once a day and change the water once in two weeks. These days automatic food dispensers are available, so all you need to do is fill it once in 10 days and the machine looks after feeding the fish. You can also get a filter fitted in the aquarium, so that the cleaning is done automatically. The most common low-maintenance aquarium fish are catfish, guppies, mollies, sword-tails and betta fish.