POWER FILTER - This powerful internal aquarium filter has high directional flow, convenient easy to replace carbon filter cartridges, includes ceramic bio-media and a venturi for aeration SPACE SAVING - this filter is designed to conveniently fit into the corner of your aquarium, saving space FIVE STAGE FILTRATION - Bio-Media creates a home for essential bacteria which remove toxic waste, mechanical sponge traps large waste particles, mechanical floss traps finer waste, carbon to purify water by removing dyes and toxins, Venturi injects tiny bubbles to aerate the water EASY ADJUST FLOW RATE AND DIRECTION - with easy flow rate control and flow direction adjustment, comes with optional spray bar tube control and flow direction adjustment EASY FIT - simple to fit, just pop into the desired corner of your aquarium and secure with the suction cups provided