
Many people mistakenly assume that you can keep the same number of fish in a 20-gallon standard tank as you can in a 20-gallon tall tank. This issue is particularly important to consider when you are thinking about the shape of a tank – standard tanks are rectangular with a greater width than height but some tanks come in “tall” sizes with walls that are taller than they are wide. Therefore, you should try to maximize the surface area in your aquarium. This leads to greater oxygen absorption by the water.
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The greater this surface area is, the more water that is in contact with the air at any given moment.


Before discussing specific methods, it is important to address the surface area of the water in your aquarium.
