The Hagen A287 is ideal for aquariums of the following size:
The Marina S20 Power Filter Quiet Aquarium Pump has a motor that is submerged into the water of the aquarium. The Marina S20 includes 2 Bio-Carb filters and 2 Bio-Clear filters, made with Ceramitek, a highly porous ceramic filter medium. This aquarium power filter also includes a strainer sponge that protects small fish from being drawn into the filter. This aquarium filter system is equipped with adjustable flow control.
The Hagen A287 specifications: