A water changing and cleaning system and device for bowl, aquarium or pond kept pet fish is disclosed. You can pour the fish directly from a bowl into this invention, (capacity is unlimited due to flow through design). Device comprises a container within a container, the inner container features a gill port, running horizontally and flush with the bottom of the container, water flows through the inner container and rises in the space between the two containers, until it overflows from the provided outlet on the outer container, carrying unwanted matter with it. Using a source of clean water to flush through the device, once a satisfactory level of cleanliness is observed the inner container is removed and the fish is returned to its cleaned Bowl. The fish was never out of water during the process. Device can be used to capture fish, so no nets required.