Various embodiments of an aquarium and its method of use are disclosed. In some embodiments the aquarium includes a first container including a waste collection area, an outlet, and a conduit fluidly connecting the waste collection area and the outlet. Depending upon the particular embodiment, the aquarium may also include features such as a second container adapted and configured to mate with the first container and receive the outlet such that fluid flows from the waste collection area through the outlet and into the second container when fluid is added above a preselected fluid level. In other related embodiments, the conduit may be formed by first and second portions of the conduit formed in the first container and a separate component.
