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Big Aquariums aren't just for tankbusters (ie, larger species of fish). A general rule in fish care, is that a larger body of water is more stable than a smaller one - very often, aquarium species are far more tolerant of poor water conditions than we think, but it is usually the rapid change in water quality or temperature that will stress them the most. A larger tank is simply more stable than a smaller. Whatsmore a larger tank gives room for different fish to escape each others territories and avoid conflict (and therefore stress) within the tank. A larger tank looks far more impressive, and it is much easier to keep fish healthy.
Have a look in some of these categories for larger aquariums for sale