Aqueon - QuietFlow E 3 Internal Filter

Simple yet powerful, the Aqueon Internal E-Series Filters do a great job with small tank filtration. Low-profile design attaches quickly and easily to the back of your aquarium. Easy-to-use Aqueon filter cartridges do the dirty work and slide easily into the filter. The 3G model uses XS aqueon filter cartridges and is recommended for tanks 3 gallons and less. 25 gph.