Dymax Slim Flow is an external hang filter designed to be clipped on any side of the aquarium. Unlike the conventional internal powerhead filter, this hang filter does not take up space in the aquarium beside the cascading effect. Provide a high levels of aerobic filtration and increase oxygen levels for fish, corals, plants and other living organism in the aquarium. Dymax Slim Flo filter is equipped with an extendable intake pipe to get strainer near to the bottom of the aquarium and adjustable flow control knob for reducing filtration during feeding time.