Quite simply, a saltwater aquarium is designed to offer saltwater marine life with a familiar and contained environment. As a hobby, saltwater aquariums allow individuals to purchase fish as pets and keep them inside their home. The first saltwater fishkeeping, for personal use, became increasingly popular in the 1950's and was widely enjoyed through the use of glass aquariums that are still famous today.

A saltwater aquarium typically features the tank itself, along with a filter, lighting and an aquarium heater. A saltwater aquarium can be purchased in a variety of different sizes, including small to the very large models. For this reason, prices vary greatly depending on the size and features of the saltwater aquarium.

The features of a saltwater aquarium are very important to the survival of the marine life. As they are used to moving water, filtration is a must. Otherwise, the water would become cloudy and the fish would deteriorate quickly. While lighting is perhaps not as important as a quality filtration unit, it does provide a sense of a routine in a distinction between light and dark. While in the wild, marine life experiences the difference between day and night and will find a similar lighting routine to be similar to their natural habitat.

It is very important that the water in a saltwater aquarium be tested regularly with the use of a test kit. In addition, regular water changes are required of every saltwater aquarium in order to keep the fish's life clean and safe. Regular tap water, however, will likely feature contamination that may prove harmful to the fish. Chemicals and purifiers used to treat the water is found in most tap waters so, instead, a saltwater aquarium should be filled with distilled water. When changing the water in a saltwater aquarium, the owner must remove up to 20% of the current water and replace it with new saltwater, which is achieved through the use of a saltwater mix.

There are a number of ways to find the perfect fish and a saltwater aquarium to keep it safe. A pet shop is the most likely place to find rare saltwater marine life and provides the biggest selection, while many retail stores offer a freshwater fish selection. When purchasing, it is a good idea to ask if the fish comes with any type of guarantee and/or special car instructions. Saltwater fish are fragile and must be treated according to specific guidelines, which any pet shop owner will detail depending on the fish that you select.