Aquarium External Canister Filter

The external canister filter is the next step up in power filters. This filter is much larger than the others and is designed to filter large tanks of 50 gallons or more. The canister filter is composed of a large jarlike canister, which generally sits next to the tank. It contains filter media and activated carbon, like the other filters, but has a much more powerful motor for filtering large amounts of water. Water is drawn up by an intake suction line and sent back to the aquarium through a return line. If the return line is properly positioned, water circulation can be provided by these filters. I only recommend this kind of filter for the aquarist with a larger tank.