The Pisces F800 is a great way to provide your live fish with that healthy environment. Built to last the F800 has a flow of 800lph. Attached to this are 2 filter cups which are filled with coarse sponge to provide good biological filtration. The individual cups easily disconnect for cleaning and maintenance and are a great option to add additional bio-media to your filtration process. The F800 provides great flow to suit the bigger tank and with the venturi assembly can also assist in making sure there is a high oxygen content to the water. The F800, just slides into your tank and is attached to the glass with the provided suction caps. Plug it in and let the F800 do all the work, while you enjoy your clean tank.