How to Choose the Right Water Tank

Consider the number of fish you would like in the aquarium. The more fish in the tank, the larger it needs to be. One fish for every gallon of water, is the rule-of-thumb. So, if you only want two or three fish, a five gallon tank will suffice. However, if you want a wide variety of fish, a 20 or 30 gallon tank would be more appropriate.

Determine the location for your tank. Small bowls or plastic tanks will fit on the corner of a desk; but a large aquarium may take up as much space as a sofa. In addition, the extreme weight of a full 20 gallon tank will require that it remain in place. Unlike a fish bowl, you cannot move it to a new location on a whim.

Choose a shape for the tank. Hexagonal tanks are tall and narrow -- perfect for corner spaces. While rectangular fish tanks come in a variety of heights and widths. Hexagonal tanks also have less water surface exposed to the air, so they require more aeration. The same is true for small five gallon tanks and fish bowls.

Consider the maintenance commitment for each tank size. Large tanks require less maintenance, due to better aeration and the ability to provide filtration systems: But they do require monthly filter cleaning and chemical monitoring.

Small tanks with one or two fish, may require more frequent water changes; but they don't require extra equipment. In addition, small tanks take-down and clean faster than large tanks with a significant fish population.

Choose a material. Plastic tanks are ideal for high traffic areas and desk tops; but they are only available in small sizes. Glass is durable and comes in a variety of shapes and sizes. In addition, any glass vase or bowl can be converted into a fish tank. However, the seals on larger aquariums can leak or burst over time. Acrylic fish tanks are clearer than glass, and shatterproof. They also come in a variety of sizes. But acrylic is more expensive than glass, and it scratches easily.