The most common types of fish are small and usually schooling (tetras, Australian rainbow fish, etc.) because they have vibrant colors and make the tank look bigger.
Most people already have an idea of what fish they want to put in their aquariums. When it comes to aquascaping, getting the right type of fish is a delicate choice because there are many factors that need to be taken into consideration. There is no specific rule, but you have to think of fish behavior, their breeding cycles, and swimming habits. You should avoid fish that would disrupt your aquascape. The most common types of fish are small and usually schooling (tetras, Australian rainbow fish, etc.) because they have vibrant colors and make the tank look bigger.