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Ease of Use
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When you place fish and plants into an aquarium, you are essentially creating a small world with its own ecosystem. However, in smaller tanks it is easy to disrupt this ecosystem, resulting in damage or the deaths of fish. The size and complexity of a larger tank, and the resulting larger ecosystem, is much more resistant to disruption from any small changes you might make, such as introducing new types of fish or plants.
Type of Fish
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The type of fish you plan to use also has an impact on the size of the tank you select. Saltwater fish are much more active than freshwater fish. For this reason, they require a larger tank than freshwater fish. In addition, some types of fish don't react well when closely confined with others, and it is best give them extra room.
Location
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Some tanks are simply better suited to certain locations than others. A 90-gallon or tank would seem overlarge and silly in an apartment, but would be perfect for the lobby of a major office building or a restaurant. By the same token, a small tank that would be perfectly at home in a small apartment would be wholly inadequate for a large public space.
Relocating
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If you move frequently, consider a smaller tank --- perhaps 20 gallons or less. A tank this small you can certainly prepare and move yourself. A large tank would require much more effort to move, with regard tank and equipment as well as the fish you will be transferring. You might even have to hire professionals to move it for you.
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What Is the Right Size for a Marine Tank?
Many people like to have living things in their home or office space to make them seem less sterile. While some will choose dogs, cats or plants, other will decide to get marine tanks, or aquariums. There are many important considerations when deciding to do this, such as the type of fish you will get and the prop, plants and landscape you want to have inside the tank. One of the most important decisions, the size of the tank, is impacted by some of the other choices.