Mini internal filter for terrariums and paludariums with shallow water areas or drinking basins (e.g., for frogs, water-loving reptiles, crabs, etc.). This unique small shallow water filter is designed differently from aquarium internal filters: it does not hang but lies horizontally in the water. It is secured to the bottom of the tank with suction cups. There, it draws water from below, pumps it through a filter sponge, and releases it filtered from above. The surface movement created by this makes drinking water visible for reptiles.