As much an interactive simulation toy as it is a traditional game, Fantasy Aquarium offers DS owners five customizable, virtual aquariums of different sizes, and more than 30 different virtual creatures to populate them. As with a real-life aquarium, a fantasy aquarium's temperature, salinity, and cleanliness must be maintained for its inhabitants to thrive. Skillful tank management unlocks new creatures and objects, and players can trade fish with other Fantasy Aquarium owners, through a wireless DS connection.