Wild Creation's unique EcoAquariums provide all the benefits of a large aquarium environment in a small, easy to maintain aquarium. They are ideal for homes, offices, schools, and dormitories! Each EcoAquarium is a complete aquatic ecosystem environment that requires no additional chemicals, filters, or aeration. They only need water changed every five or six months using fresh, bottled spring water. Our "Living Gravel", which acts as the natural filtration system for the aquarium, does not need to be cleaned. Each aquarium includes at least one snail, which acts as the janitor to clean the algae and excess food so you don't have to!