Keeping fish can be a very interesting hobby, and can also add a lot of color to your living room, or which ever room you choose to have an aquarium in. Some of the more colorful fish include the marine fish, which include the percula clown shown in this picture. There is a long tentacled anemone also shown, and these can be very interesting to keep in your aquarium. Great advances have been made in the keeping of fish in aquariums. They are easier to keep than they used to be, as the technology, filtering, and lighting has improved.
There are many very colorful fresh water fish too. Some of the more colorful fish are small, maybe 1" to 3", and include fish such as neons, glo fish, platies, mollies, barbs and swordtails. These fish are usually easy to keep, and very colorful and interesting too.
There are some fish that you can buy that are small when you get them, and then in a few years will grow to over a foot in length. Some fish can be kept in aquariums for more than 25 years. Fish can make quite interesting pets.